Re: 10Mbps full duplex IOS [7:68227]
It depends on a lot of things. We found over the years even if they were set to full, and the ahrdware supported it, they would flip back to half. I am thinking we got a couple to work using GD 12.1 images, but have not visited the issue in a while. They definiately did not work on the early 12.0 images. Tim Champion wrote in message news:[EMAIL PROTECTED] I am looking for an IOS version that will support 10Mbps full duplex on a 3640. Cisco documentation suggests that this option was made available in version 12.0.4(T). I've tried numerous versions but can't find one that supports it. Any suggestions please. Tim Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=69945t=68227 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full duplex or half duplex, how can you tell [7:57431]
Priscilla Oppenheimer wrote: sam sneed wrote: this is about the comment You'd get a link but lots of collisions, eh? The half-duplex side would receive while it was sending, because the full-duplex side would send whenever it wanted. In other words, the 2500 side would report collisions, assuming there was enough simultanesous traffic. I hooked up a 2501 eth0 to a 3548 set to full duplex and speed 100. Interestingly the link light on the router lights up but no the switch. That's probably because of the speed mismatch not the duplex mismatch? In some cases you can get a link light and think everything is fine, when actually there are problems due to a duplex mismtach. Only a speed issue, not a duplex issue. When the 10/100 side is hard set to 100Mb so that it doesn't negotiate nor autosense, and the other side is a legacy 10Mb/half interface, then the 10Mb side will get a false link indication. The 100Mb fast link pulses produce enough energy in the band where the 10Mb interface is looking for them, to fool it. The 100Mb side will correctly show no link. The tip off is that the 10Mb side sees zero valid input frames in its counters. The 100Mb transmitter appears to be forever streaming. - Marty Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=57672t=57431 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full duplex or half duplex, how can you tell [7:57431]
Wow! Two ethernets! Bonus! I once worked on a 2501 and I only had one ethernet...AND it was AUI! --Mark Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=57519t=57431 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
full duplex or half duplex, how can you tell [7:57431]
Hi, I have a cisco 2516 router with an ethernet interface. How can I find out if this inteface is full duplex or half duplex? Thanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=57431t=57431 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: full duplex or half duplex, how can you tell [7:57431]
John, It will be half duplex unless it has been configured for full duplex. Setting an ethernet interface to full duplex is done in software and requires a recent IOS. I have forgotten the minimum rev required but I know 12.2.3 will work. Dave Swink -Original Message- From: [EMAIL PROTECTED] [mailto:nobody;groupstudy.com]On Behalf Of John Tafasi Sent: Thursday, November 14, 2002 4:57 AM To: [EMAIL PROTECTED] Subject: full duplex or half duplex, how can you tell [7:57431] Hi, I have a cisco 2516 router with an ethernet interface. How can I find out if this inteface is full duplex or half duplex? Thanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=57433t=57431 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full duplex or half duplex, how can you tell [7:57431]
John, Cisco's 25xx series uses the AMD Lance Chip for their 10Mbit Ethernet Interface. This Chipset does not support full-duplex at all. Router#show controllers ethernet 0 LANCE unit 0, ^ Have never used a 2516 myself but as far as i know it has a simple 10Mbit Ethernet Hub built in. FullDuplex Operation would require a switch. Regards Reinhold On Thu, Nov 14, 2002 at 10:56:50AM +, John Tafasi wrote: Hi, I have a cisco 2516 router with an ethernet interface. How can I find out if this inteface is full duplex or half duplex? Thanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=57443t=57431 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full duplex or half duplex, how can you tell [7:57431]
John Tafasi wrote in message news:200211141056.KAA04663;groupstudy.com... Hi, I have a cisco 2516 router with an ethernet interface. How can I find out if this inteface is full duplex or half duplex? plug it into a full duplex 100 mbs switch port and see if link occurs? seriously, I believe all routers in the 25xx line are 10/half. there is no report on speed and duplex on routers that I can find. show int on a switch gives you a status Encapsulation ARPA, loopback not set Keepalive set (10 sec) Auto-duplex, Auto-speed even on a router with a port that do duplex changes ( 3640 NM-4E )there is no status. I don't have access to a router with a port that permits speed and duplex changes.so I can't compare. Thanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=57445t=57431 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full duplex or half duplex, how can you tell [7:57431]
The Long and Winding Road wrote: John Tafasi wrote in message news:200211141056.KAA04663;groupstudy.com... Hi, I have a cisco 2516 router with an ethernet interface. How can I find out if this inteface is full duplex or half duplex? plug it into a full duplex 100 mbs switch port and see if link occurs? You'd get a link but lots of collisions, eh? The half-duplex side would receive while it was sending, because the full-duplex side would send whenever it wanted. In other words, the 2500 side would report collisions, assuming there was enough simultanesous traffic. I think the best answer is that the 2500 routers pre-date the full-duplex standard. I bet they don't do full-duplex. seriously, I believe all routers in the 25xx line are 10/half. there is no report on speed and duplex on routers that I can find. That's annoying. I guess show run would show you a non-default setting, but that's not too helpful. Priscilla show int on a switch gives you a status Encapsulation ARPA, loopback not set Keepalive set (10 sec) Auto-duplex, Auto-speed even on a router with a port that do duplex changes ( 3640 NM-4E )there is no status. I don't have access to a router with a port that permits speed and duplex changes.so I can't compare. Thanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=57457t=57431 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full duplex or half duplex, how can you tell [7:57431]
this is about the comment You'd get a link but lots of collisions, eh? The half-duplex side would receive while it was sending, because the full-duplex side would send whenever it wanted. In other words, the 2500 side would report collisions, assuming there was enough simultanesous traffic. I hooked up a 2501 eth0 to a 3548 set to full duplex and speed 100. Interestingly the link light on the router lights up but no the switch. The switch sees the total link down and would not even bother sending. I plugged it into an auto-neg port and it obviously worked. Here is the output from switch. Cisco3500-3#sh int fa0/17 FastEthernet0/17 is down, line protocol is down Hardware is Fast Ethernet, address is 0002.fd45.4b91 (bia 0002.fd45.4b91) MTU 1500 bytes, BW 0 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Full-duplex, 100Mb/s, 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output never, output hang never Last clearing of show interface counters 1y40w Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 0 multicast 0 input packets with dribble condition detected 0 packets output, 0 bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out Cisco3500-3# Priscilla Oppenheimer wrote in message news:200211141830.SAA03800;groupstudy.com... The Long and Winding Road wrote: John Tafasi wrote in message news:200211141056.KAA04663;groupstudy.com... Hi, I have a cisco 2516 router with an ethernet interface. How can I find out if this inteface is full duplex or half duplex? plug it into a full duplex 100 mbs switch port and see if link occurs? You'd get a link but lots of collisions, eh? The half-duplex side would receive while it was sending, because the full-duplex side would send whenever it wanted. In other words, the 2500 side would report collisions, assuming there was enough simultanesous traffic. I think the best answer is that the 2500 routers pre-date the full-duplex standard. I bet they don't do full-duplex. seriously, I believe all routers in the 25xx line are 10/half. there is no report on speed and duplex on routers that I can find. That's annoying. I guess show run would show you a non-default setting, but that's not too helpful. Priscilla show int on a switch gives you a status Encapsulation ARPA, loopback not set Keepalive set (10 sec) Auto-duplex, Auto-speed even on a router with a port that do duplex changes ( 3640 NM-4E )there is no status. I don't have access to a router with a port that permits speed and duplex changes.so I can't compare. Thanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=57466t=57431 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: full duplex or half duplex, how can you tell [7:57431]
sam, I think the 2500 series uses the AUI port for Ethernet, so I think this is why the hardware doesn't support 100/full. I guess they had to make sacrifices for flexibility that, in hindsight, probably weren't necessary. GM -Original Message- From: sam sneed [mailto:vristevski;hotmail.com] Sent: Thursday, November 14, 2002 3:21 PM To: [EMAIL PROTECTED] Subject: Re: full duplex or half duplex, how can you tell [7:57431] this is about the comment You'd get a link but lots of collisions, eh? The half-duplex side would receive while it was sending, because the full-duplex side would send whenever it wanted. In other words, the 2500 side would report collisions, assuming there was enough simultanesous traffic. I hooked up a 2501 eth0 to a 3548 set to full duplex and speed 100. Interestingly the link light on the router lights up but no the switch. The switch sees the total link down and would not even bother sending. I plugged it into an auto-neg port and it obviously worked. Here is the output from switch. Cisco3500-3#sh int fa0/17 FastEthernet0/17 is down, line protocol is down Hardware is Fast Ethernet, address is 0002.fd45.4b91 (bia 0002.fd45.4b91) MTU 1500 bytes, BW 0 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Full-duplex, 100Mb/s, 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output never, output hang never Last clearing of show interface counters 1y40w Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 0 multicast 0 input packets with dribble condition detected 0 packets output, 0 bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out Cisco3500-3# Priscilla Oppenheimer wrote in message news:200211141830.SAA03800;groupstudy.com... The Long and Winding Road wrote: John Tafasi wrote in message news:200211141056.KAA04663;groupstudy.com... Hi, I have a cisco 2516 router with an ethernet interface. How can I find out if this inteface is full duplex or half duplex? plug it into a full duplex 100 mbs switch port and see if link occurs? You'd get a link but lots of collisions, eh? The half-duplex side would receive while it was sending, because the full-duplex side would send whenever it wanted. In other words, the 2500 side would report collisions, assuming there was enough simultanesous traffic. I think the best answer is that the 2500 routers pre-date the full-duplex standard. I bet they don't do full-duplex. seriously, I believe all routers in the 25xx line are 10/half. there is no report on speed and duplex on routers that I can find. That's annoying. I guess show run would show you a non-default setting, but that's not too helpful. Priscilla show int on a switch gives you a status Encapsulation ARPA, loopback not set Keepalive set (10 sec) Auto-duplex, Auto-speed even on a router with a port that do duplex changes ( 3640 NM-4E )there is no status. I don't have access to a router with a port that permits speed and duplex changes.so I can't compare. Thanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=57469t=57431 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full duplex or half duplex, how can you tell [7:57431]
The Long and Winding Road wrote: John Tafasi wrote in message news:200211141056.KAA04663;groupstudy.com... Hi, I have a cisco 2516 router with an ethernet interface. How can I find out if this inteface is full duplex or half duplex? plug it into a full duplex 100 mbs switch port and see if link occurs? seriously, I believe all routers in the 25xx line are 10/half. there is no report on speed and duplex on routers that I can find. show int on a switch gives you a status Encapsulation ARPA, loopback not set Keepalive set (10 sec) Auto-duplex, Auto-speed even on a router with a port that do duplex changes ( 3640 NM-4E )there is no status. Interesting - I'd never twigged to this. A FastEthernet port certainly gives this information Full-duplex, 100Mb/s, 100BaseTX/FX but an ethernet port on the same router (a 3600) doesn't show it. I'd guess that the code for 'show ethernet' on the routers that do support full-duplex comes straight from the routers that don't support it ;-) I don't have access to a router with a port that permits speed and duplex changes.so I can't compare. Thanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=57471t=57431 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full duplex or half duplex, how can you tell [7:57431]
sam sneed wrote: this is about the comment You'd get a link but lots of collisions, eh? The half-duplex side would receive while it was sending, because the full-duplex side would send whenever it wanted. In other words, the 2500 side would report collisions, assuming there was enough simultanesous traffic. I hooked up a 2501 eth0 to a 3548 set to full duplex and speed 100. Interestingly the link light on the router lights up but no the switch. That's probably because of the speed mismatch not the duplex mismatch? In some cases you can get a link light and think everything is fine, when actually there are problems due to a duplex mismtach. I don't have the equipment to show you an example, but I know I've seen it. Needless to say, it makes troubleshooting difficult. Priscilla The switch sees the total link down and would not even bother sending. I plugged it into an auto-neg port and it obviously worked. Here is the output from switch. Cisco3500-3#sh int fa0/17 FastEthernet0/17 is down, line protocol is down Hardware is Fast Ethernet, address is 0002.fd45.4b91 (bia 0002.fd45.4b91) MTU 1500 bytes, BW 0 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Full-duplex, 100Mb/s, 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output never, output hang never Last clearing of show interface counters 1y40w Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 0 multicast 0 input packets with dribble condition detected 0 packets output, 0 bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out Cisco3500-3# Priscilla Oppenheimer wrote in message news:200211141830.SAA03800;groupstudy.com... The Long and Winding Road wrote: John Tafasi wrote in message news:200211141056.KAA04663;groupstudy.com... Hi, I have a cisco 2516 router with an ethernet interface. How can I find out if this inteface is full duplex or half duplex? plug it into a full duplex 100 mbs switch port and see if link occurs? You'd get a link but lots of collisions, eh? The half-duplex side would receive while it was sending, because the full-duplex side would send whenever it wanted. In other words, the 2500 side would report collisions, assuming there was enough simultanesous traffic. I think the best answer is that the 2500 routers pre-date the full-duplex standard. I bet they don't do full-duplex. seriously, I believe all routers in the 25xx line are 10/half. there is no report on speed and duplex on routers that I can find. That's annoying. I guess show run would show you a non-default setting, but that's not too helpful. Priscilla show int on a switch gives you a status Encapsulation ARPA, loopback not set Keepalive set (10 sec) Auto-duplex, Auto-speed even on a router with a port that do duplex changes ( 3640 NM-4E )there is no status. I don't have access to a router with a port that permits speed and duplex changes.so I can't compare. Thanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=57472t=57431 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full duplex or half duplex, how can you tell [7:57431]
That was correct. I changed the speed to 10 full duplex and got the link a both sides. I just thought it was odd that one side(router) had the link light on but the switch didn't. Cisco3500-3#sh int fa0/17 FastEthernet0/17 is up, line protocol is up Hardware is Fast Ethernet, address is 0002.fd45.4b91 (bia 0002.fd45.4b91) MTU 1500 bytes, BW 1 Kbit, DLY 1000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Full-duplex, 10Mb/s, 100BaseTX/FX Priscilla Oppenheimer wrote in message news:200211142203.WAA18335;groupstudy.com... sam sneed wrote: this is about the comment You'd get a link but lots of collisions, eh? The half-duplex side would receive while it was sending, because the full-duplex side would send whenever it wanted. In other words, the 2500 side would report collisions, assuming there was enough simultanesous traffic. I hooked up a 2501 eth0 to a 3548 set to full duplex and speed 100. Interestingly the link light on the router lights up but no the switch. That's probably because of the speed mismatch not the duplex mismatch? In some cases you can get a link light and think everything is fine, when actually there are problems due to a duplex mismtach. I don't have the equipment to show you an example, but I know I've seen it. Needless to say, it makes troubleshooting difficult. Priscilla The switch sees the total link down and would not even bother sending. I plugged it into an auto-neg port and it obviously worked. Here is the output from switch. Cisco3500-3#sh int fa0/17 FastEthernet0/17 is down, line protocol is down Hardware is Fast Ethernet, address is 0002.fd45.4b91 (bia 0002.fd45.4b91) MTU 1500 bytes, BW 0 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Full-duplex, 100Mb/s, 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output never, output hang never Last clearing of show interface counters 1y40w Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 0 multicast 0 input packets with dribble condition detected 0 packets output, 0 bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out Cisco3500-3# Priscilla Oppenheimer wrote in message news:200211141830.SAA03800;groupstudy.com... The Long and Winding Road wrote: John Tafasi wrote in message news:200211141056.KAA04663;groupstudy.com... Hi, I have a cisco 2516 router with an ethernet interface. How can I find out if this inteface is full duplex or half duplex? plug it into a full duplex 100 mbs switch port and see if link occurs? You'd get a link but lots of collisions, eh? The half-duplex side would receive while it was sending, because the full-duplex side would send whenever it wanted. In other words, the 2500 side would report collisions, assuming there was enough simultanesous traffic. I think the best answer is that the 2500 routers pre-date the full-duplex standard. I bet they don't do full-duplex. seriously, I believe all routers in the 25xx line are 10/half. there is no report on speed and duplex on routers that I can find. That's annoying. I guess show run would show you a non-default setting, but that's not too helpful. Priscilla show int on a switch gives you a status Encapsulation ARPA, loopback not set Keepalive set (10 sec) Auto-duplex, Auto-speed even on a router with a port that do duplex changes ( 3640 NM-4E )there is no status. I don't have access to a router with a port that permits speed and duplex changes.so I can't compare. Thanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=57474t=57431 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full duplex or half duplex, how can you tell [7:57431]
Heck when the 2500 was first introduced I don't know if 100M was even available and even if it was the CPU couldn't handle it. The 2514 could not drive it's 2 ethernets! Dave Mossburg, Geoff (MAN-Corporate) wrote: sam, I think the 2500 series uses the AUI port for Ethernet, so I think this is why the hardware doesn't support 100/full. I guess they had to make sacrifices for flexibility that, in hindsight, probably weren't necessary. GM -Original Message- From: sam sneed [mailto:vristevski;hotmail.com] Sent: Thursday, November 14, 2002 3:21 PM To: [EMAIL PROTECTED] Subject: Re: full duplex or half duplex, how can you tell [7:57431] this is about the comment You'd get a link but lots of collisions, eh? The half-duplex side would receive while it was sending, because the full-duplex side would send whenever it wanted. In other words, the 2500 side would report collisions, assuming there was enough simultanesous traffic. I hooked up a 2501 eth0 to a 3548 set to full duplex and speed 100. Interestingly the link light on the router lights up but no the switch. The switch sees the total link down and would not even bother sending. I plugged it into an auto-neg port and it obviously worked. Here is the output from switch. Cisco3500-3#sh int fa0/17 FastEthernet0/17 is down, line protocol is down Hardware is Fast Ethernet, address is 0002.fd45.4b91 (bia 0002.fd45.4b91) MTU 1500 bytes, BW 0 Kbit, DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation ARPA, loopback not set Keepalive not set Full-duplex, 100Mb/s, 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input never, output never, output hang never Last clearing of show interface counters 1y40w Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 0 packets input, 0 bytes Received 0 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 0 multicast 0 input packets with dribble condition detected 0 packets output, 0 bytes, 0 underruns 0 output errors, 0 collisions, 2 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out Cisco3500-3# Priscilla Oppenheimer wrote in message news:200211141830.SAA03800;groupstudy.com... The Long and Winding Road wrote: John Tafasi wrote in message news:200211141056.KAA04663;groupstudy.com... Hi, I have a cisco 2516 router with an ethernet interface. How can I find out if this inteface is full duplex or half duplex? plug it into a full duplex 100 mbs switch port and see if link occurs? You'd get a link but lots of collisions, eh? The half-duplex side would receive while it was sending, because the full-duplex side would send whenever it wanted. In other words, the 2500 side would report collisions, assuming there was enough simultanesous traffic. I think the best answer is that the 2500 routers pre-date the full-duplex standard. I bet they don't do full-duplex. seriously, I believe all routers in the 25xx line are 10/half. there is no report on speed and duplex on routers that I can find. That's annoying. I guess show run would show you a non-default setting, but that's not too helpful. Priscilla show int on a switch gives you a status Encapsulation ARPA, loopback not set Keepalive set (10 sec) Auto-duplex, Auto-speed even on a router with a port that do duplex changes ( 3640 NM-4E )there is no status. I don't have access to a router with a port that permits speed and duplex changes.so I can't compare. Thanks -- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367 You don't make the poor richer by making the rich poorer. --Winston Churchill Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=57475t=57431 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: A HUB can work in Full-duplex mode? [7:52973]
Priscilla Oppenheimer wrote: What is an internal switch in a hub? Is that another case of a marketing term? ;-) I've never heard of the term. I believe that it is usually a bridge between the 10mb segment and 100Mb segment in a dual speed hub. Naturally the marketing people use the term switch :-) Peter Walker CISSP, CSS1, CIPTSS, CCIP, CCNP, etc Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=53068t=52973 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: A HUB can work in Full-duplex mode? [7:52973]
My understanding of a 10/100 hub is it has a bridge/switch internally to connect the 10Mbps side to the 100Mbps side (a repeater wouldn't be able to do this). Priscilla Oppenheimer 09/10/02 05:03PM Ken Diliberto wrote: But can the internal switch in a 10/100 hub work in full duplex??? What is an internal switch in a hub? Is that another case of a marketing term? ;-) I've never heard of the term. If it's really a hub, then it's just a repeater. Full duplex has no meaning in this contect. Keep in mind that no self-respecting Ethernet guru EVER used the terms half-duplex or full-duplex when talking about Ethernet until a few years ago. Ethernet was plainly and simply CSMA/CD. (MA stands for multiple access, and is of course not full duplex.) Hubs come from this environment. Nobody used the term switch fabric or hub fabric or internal switch either. ;-) A hub was a dumb physical-layer repeater that did the things I mentioned below, (with a few data-link-layer jobs thrown in to ensure collision detection works correctly for the end hosts in a network extended with repeaters/hubs.) Priscilla (Don't know why I decided to ask that question other than to cause trouble...) Ken the Trouble Maker [snip] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=53106t=52973 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: A HUB can work in Full-duplex mode? [7:52973]
Ken Diliberto wrote: My understanding of a 10/100 hub is it has a bridge/switch internally to Technically there's no such thing as a 10/100 hub. If a device connects two different speed networks, it has to do store and forward of frames (not just forwarding of bits) and hence is a bridge or switch. I wouldn't call a device that does both, includes hub ports and an internal bridge/switch as you mention, a hub, but product names are chosen by marketing people not engineers. Shall we create a new term? Brub or swub or hubge or hubtch. To quote my co-author in Troubleshooting Campus Networks, it's amazing the terminology that can result when one engineer and two marketing people go out to lunch. He threw that in a few times in our book. :-) Priscilla connect the 10Mbps side to the 100Mbps side (a repeater wouldn't be able to do this). Priscilla Oppenheimer 09/10/02 05:03PM Ken Diliberto wrote: But can the internal switch in a 10/100 hub work in full duplex??? What is an internal switch in a hub? Is that another case of a marketing term? ;-) I've never heard of the term. If it's really a hub, then it's just a repeater. Full duplex has no meaning in this contect. Keep in mind that no self-respecting Ethernet guru EVER used the terms half-duplex or full-duplex when talking about Ethernet until a few years ago. Ethernet was plainly and simply CSMA/CD. (MA stands for multiple access, and is of course not full duplex.) Hubs come from this environment. Nobody used the term switch fabric or hub fabric or internal switch either. ;-) A hub was a dumb physical-layer repeater that did the things I mentioned below, (with a few data-link-layer jobs thrown in to ensure collision detection works correctly for the end hosts in a network extended with repeaters/hubs.) Priscilla (Don't know why I decided to ask that question other than to cause trouble...) Ken the Trouble Maker [snip] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=53129t=52973 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: A HUB can work in Full-duplex mode? [7:52973]
At 6:45 PM + 9/11/02, Priscilla Oppenheimer wrote: Ken Diliberto wrote: My understanding of a 10/100 hub is it has a bridge/switch internally to Technically there's no such thing as a 10/100 hub. If a device connects two different speed networks, it has to do store and forward of frames (not just forwarding of bits) and hence is a bridge or switch. I wouldn't call a device that does both, includes hub ports and an internal bridge/switch as you mention, a hub, but product names are chosen by marketing people not engineers. Shall we create a new term? Brub or swub or hubge or hubtch. In the proposed joint venture between Cisco and Synoptics, the term selected for router/hub technology was called a rub or rubsystem. You can find this in an early version of the Internetworking Glossary. When I brought this up to a CID class, one of my students mused..router/hub...hub/router...why didn't they call it a hooter? Priscilla is quite correct technically. There is no standard definition of hub. Cabletron, for example, had a marketing approach which called any multislot chassis a hub, into which you could plug L1, L2, or L3 boards. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=53142t=52973 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: A HUB can work in Full-duplex mode? [7:52973]
It's fun arguing marketing-speak with engineering folks. :-) I see a 10/100 Sub (I like that one the best) as two hubs with a bridge between them. Based on the connect speed, a port can participate on either the 10Mbps side or the 100Mbps side. I was just wondering if that bridge was full or half duplex... :-) P.S. I just jumped into this thread for the fun of it. I'm getting my moneys worth. :-) Priscilla Oppenheimer 09/11/02 11:45AM Ken Diliberto wrote: My understanding of a 10/100 hub is it has a bridge/switch internally to Technically there's no such thing as a 10/100 hub. If a device connects two different speed networks, it has to do store and forward of frames (not just forwarding of bits) and hence is a bridge or switch. I wouldn't call a device that does both, includes hub ports and an internal bridge/switch as you mention, a hub, but product names are chosen by marketing people not engineers. Shall we create a new term? Brub or swub or hubge or hubtch. To quote my co-author in Troubleshooting Campus Networks, it's amazing the terminology that can result when one engineer and two marketing people go out to lunch. He threw that in a few times in our book. :-) Priscilla [snip] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=53166t=52973 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: A HUB can work in Full-duplex mode? [7:52973]
Ken Diliberto wrote: It's fun arguing marketing-speak with engineering folks. :-) I see a 10/100 Sub (I like that one the best) as two hubs with a bridge between them. Based on the connect speed, a port can participate on either the 10Mbps side or the 100Mbps side. I was just wondering if that bridge was full or half duplex... :-) It would have to be half-duplex since the only ports it can communicate with are hub ports on the hub sides of the sub. Priscilla P.S. I just jumped into this thread for the fun of it. I'm getting my moneys worth. :-) Priscilla Oppenheimer 09/11/02 11:45AM Ken Diliberto wrote: My understanding of a 10/100 hub is it has a bridge/switch internally to Technically there's no such thing as a 10/100 hub. If a device connects two different speed networks, it has to do store and forward of frames (not just forwarding of bits) and hence is a bridge or switch. I wouldn't call a device that does both, includes hub ports and an internal bridge/switch as you mention, a hub, but product names are chosen by marketing people not engineers. Shall we create a new term? Brub or swub or hubge or hubtch. To quote my co-author in Troubleshooting Campus Networks, it's amazing the terminology that can result when one engineer and two marketing people go out to lunch. He threw that in a few times in our book. :-) Priscilla [snip] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=53179t=52973 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: A HUB can work in Full-duplex mode? [7:52973]
I agree with you there. Do you think these boxes run Spamming Tree??? ;-) Priscilla Oppenheimer 09/11/02 09:07PM Ken Diliberto wrote: It's fun arguing marketing-speak with engineering folks. :-) I see a 10/100 Sub (I like that one the best) as two hubs with a bridge between them. Based on the connect speed, a port can participate on either the 10Mbps side or the 100Mbps side. I was just wondering if that bridge was full or half duplex... :-) It would have to be half-duplex since the only ports it can communicate with are hub ports on the hub sides of the sub. Priscilla Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=53183t=52973 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
A HUB can work in Full-duplex mode? [7:52973]
Just I want to know can a Hub work in full-duplex mode? Saravanan *** This message is proprietary to Future Software Limited (FSL) and is intended solely for the use of the individual to whom it is addressed. It may contain privileged or confidential information and should not be circulated or used for any purpose other than for what it is intended. If you have received this message in error, please notify the originator immediately. If you are not the intended recipient, you are notified that you are strictly prohibited from using, copying, altering, or disclosing the contents of this message. FSL accepts no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus. *** Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=52973t=52973 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: A HUB can work in Full-duplex mode? [7:52973]
No. The collision domain on a hub is shared throughout causing each port to listen before transmitting. A switch on the other had limits the collision domains by port therefore allowing the host to transmit at will. - Original Message - From: Saravanan L To: Sent: Tuesday, September 10, 2002 2:59 AM Subject: A HUB can work in Full-duplex mode? [7:52973] Just I want to know can a Hub work in full-duplex mode? Saravanan *** This message is proprietary to Future Software Limited (FSL) and is intended solely for the use of the individual to whom it is addressed. It may contain privileged or confidential information and should not be circulated or used for any purpose other than for what it is intended. If you have received this message in error, please notify the originator immediately. If you are not the intended recipient, you are notified that you are strictly prohibited from using, copying, altering, or disclosing the contents of this message. FSL accepts no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus. *** Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=52979t=52973 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: A HUB can work in Full-duplex mode? [7:52973]
r34rv13wm1rr0r wrote: No. The collision domain on a hub is shared throughout causing each port to listen before transmitting. No is correct. A hub can't be configured for full-duplex. If it can be, it's been misnamed. It's really a switch. But the explanation is not correct. A hub port doesn't listen before sending. It doesn't do MAC data-link-layer tasks. It simply forward bits that come in one port out all other ports. On a proper-sized network, the sending end hosts will still be monitoring their transmission, notice any collisions, and retransmit. In my new book, Troubleshooting Campus Networks, I have the following relevant paragraphs: Collisions on Networks with Hubs and Switches A hub is a repeater that simplifies cabling designs, permitting a star configuration with a hub at the center, like the hub in an old hub-and-spoke wheel. Repeaters and hubs have a few other important jobs and characteristics also. Signals going through a repeater are retimed using the repeater#8217;s timing circuitry to prevent the accumulation of signal jitter. A repeater also regenerates the signal to the proper amplitude and symmetry. Another job of a repeater is to rebuild a received preamble to avoid preambles getting shorter as they go through repeaters#8217; timing circuits. Repeaters also extend any fragments that have resulted from frames that collided and were cut short. The repeater extends the signal so that the total number of bits output equals 96 bits. Fragment extension ensures that short collision fragments survive a trip through a maximum-size network in the correct time frame. Stations receiving the extended fragment discard it and also defer from sending until the collision event is over. One of the most important tasks of a repeater is to enforce collisions on each connected segment. Repeaters enforce collisions by transmitting a collision-enforcement jam signal. Upon detecting a collision on one segment, a repeater transmits a collision enforcement jam signal on that segment and all other connected segments. This ensures that any station trying to send at that moment hears the collision. In this way, a repeater makes sure all stations are in the same collision domain and can react to collisions correctly. When a repeater detects a collision, it sends a 96-bit jam composed of alternating ones and zeros. Switches are replacing hubs in large campus networks. It is a common misconception that switches don#8217;t need to know about CSMA/CD and that collisions don#8217;t occur on switched networks. In fact, each switch port implements the CSMA/CD standard. When sending a frame, a half-duplex switch port senses carrier, defers if necessary, detects collisions, backs off, and retransmits. Whether a collision might occur or not depends on what is connected to the switched port. If a shared medium is connected to the switch, collisions may occur. Ethernet troubleshooters often wonder about cut-through switches and collisions. A cut-through switch outputs bits as soon as the destination address has been received and the destination port determined. What if there is a collision on that port? Should the switch send a collision enforcement jam on the port that received the frame so the original sender knows to try again? Or has the switch cached the frame so that it can do the retransmitting? Some troubleshooters assume that cut-through processing means that the frame was not cached. Vendor implementations may vary, but Cisco cut-through switches cache all frames, even when in cut-through mode. In this way, each port can handle CSMA/CD duties for that port and no other port. A switch retransmits if a collision occurs and does not notify the original sender in any way. Each port truly delimits a collision domain. Priscilla Oppenheimer A switch on the other had limits the collision domains by port therefore allowing the host to transmit at will. - Original Message - From: Saravanan L To: Sent: Tuesday, September 10, 2002 2:59 AM Subject: A HUB can work in Full-duplex mode? [7:52973] Just I want to know can a Hub work in full-duplex mode? Saravanan *** This message is proprietary to Future Software Limited (FSL) and is intended solely for the use of the individual to whom it is addressed. It may contain privileged or confidential information and should not be circulated or used for any purpose other than for what it is intended. If you have received this message in error, please notify the originator immediately. If you are not the intended recipient, you are notified that you are strictly prohibited from using, copying, altering, or disclosing the contents of this message. FSL accepts no responsibility for loss or damage arising from the use of the information transmitted by this email including damage from virus
Re: A HUB can work in Full-duplex mode? [7:52973]
But can the internal switch in a 10/100 hub work in full duplex??? (Don't know why I decided to ask that question other than to cause trouble...) Ken the Trouble Maker Priscilla Oppenheimer 09/10/02 03:18PM r34rv13wm1rr0r wrote: No. The collision domain on a hub is shared throughout causing each port to listen before transmitting. No is correct. A hub can't be configured for full-duplex. If it can be, it's been misnamed. It's really a switch. But the explanation is not correct. A hub port doesn't listen before sending. It doesn't do MAC data-link-layer tasks. It simply forward bits that come in one port out all other ports. On a proper-sized network, the sending end hosts will still be monitoring their transmission, notice any collisions, and retransmit. [snip] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=53045t=52973 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: A HUB can work in Full-duplex mode? [7:52973]
Ken Diliberto wrote: But can the internal switch in a 10/100 hub work in full duplex??? What is an internal switch in a hub? Is that another case of a marketing term? ;-) I've never heard of the term. If it's really a hub, then it's just a repeater. Full duplex has no meaning in this contect. Keep in mind that no self-respecting Ethernet guru EVER used the terms half-duplex or full-duplex when talking about Ethernet until a few years ago. Ethernet was plainly and simply CSMA/CD. (MA stands for multiple access, and is of course not full duplex.) Hubs come from this environment. Nobody used the term switch fabric or hub fabric or internal switch either. ;-) A hub was a dumb physical-layer repeater that did the things I mentioned below, (with a few data-link-layer jobs thrown in to ensure collision detection works correctly for the end hosts in a network extended with repeaters/hubs.) Priscilla (Don't know why I decided to ask that question other than to cause trouble...) Ken the Trouble Maker Priscilla Oppenheimer 09/10/02 03:18PM r34rv13wm1rr0r wrote: No. The collision domain on a hub is shared throughout causing each port to listen before transmitting. No is correct. A hub can't be configured for full-duplex. If it can be, it's been misnamed. It's really a switch. But the explanation is not correct. A hub port doesn't listen before sending. It doesn't do MAC data-link-layer tasks. It simply forward bits that come in one port out all other ports. On a proper-sized network, the sending end hosts will still be monitoring their transmission, notice any collisions, and retransmit. [snip] Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=53046t=52973 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Full-Duplex Communication [7:47562]
Full-Duplex Communication You can select half-duplex or full-duplex communication. The advantage of using full-duplex is that communication packets can flow in both directions simultaneously, which results in doubling the throughput capacity on the segment. Full-duplex communication eliminates the performance degradation resulting from packet collisions. Packets cannot collide because they each travel on their own path--like cars going in opposite directions on a two-lane highway. So while the effective bandwidth to a 10BaseT port configured for half-duplex Ethernet is a maximum of 10 Mbps, with full-duplex Ethernet it is doubled to 20 Mbps. http://www.cisco.com/univercd/cc/td/doc/product/lan/cat3ks/3000/acopspcs.htm Catalyst 5000 Series Supervisor II engine ports on 10/100 ports on Fast EtherChannel-capable line cards enable high-speed connectivity between switches, switches and routers, and switches and servers. Up to four Fast Ethernet ports can be grouped to provide up to 800 Mbps of load-sharing, redundant, and point-to-point connections between the Catalyst 5500, 5509, 5505, 5002, and 5000 switches. To achieve higher bandwidth, Gigabit EtherChannel can be deployed, which supports up to 8 Gbps (full-duplex) of inter-switch bandwidth, and is supported across the Catalyst 5000 Family. http://www.cisco.com/univercd/cc/td/doc/pcat/ca5000.htm If I connect a server to a swtich full duplex then if only one client connected with its gig eth card, he can't use 2 gigs. I think they are writing these manuals incorrectly. Cause you can use 1 gig for sending 1 gig for receiving. Not 2 gigs sending and receiving. If you say to a customer that with gig ether channel they can reach up to 8 gigs on 6500 swithes he will obviously thinks that he can send 8 gig and receive 8 gig not 4 gig RX for gig TX. Best regards, Cisco Breaker Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=47562t=47562 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Full-Duplex Communication [7:47562]
Cisco Breaker wrote: If I connect a server to a swtich full duplex then if only one client connected with its gig eth card, he can't use 2 gigs. I think they are writing these manuals incorrectly. Cause you can use 1 gig for sending 1 gig for receiving. Not 2 gigs sending and receiving. I wouldn't say they're writing the manuals incorrectly. If anything, I think they've made it clear that you have the rated bandwidth of the link available in each direction. If you say to a customer that with gig ether channel they can reach up to 8 gigs on 6500 swithes he will obviously thinks that he can send 8 gig and receive 8 gig not 4 gig RX for gig TX. If you say to a customer that with did etherchannel they can reach up to 8 gigs in each direction, then you would be at fault for misrepresenting the technology. If you say that you can reach 8 gigs in total bandwidth, then that would be a true statement. But as the other person said, people that use this everyday know what it means, and it's up to us to make sure the customer knows what it means. Mike W. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=47568t=47562 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Full-Duplex Communication [7:47562]
That is a marketing issue, not a technical one. The people who work with switches everyday understand that when you are talking about full-duplex bandwidth, it's split between up and down. It's up to us to educate the decision-makers and end-users, rather than muddle with the marketese. Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=47567t=47562 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Cisco 7507 PA-4E full duplex operation [7:34076]
Cisco states that their PA-4E module (four port 10BaseT) for 7500 Series routers is capable of being configured for full duplex operation. Under the ethernet interface, no full-duplex option available. Also, the command no half-duplex returns Invalid input. Has anyone configured this module for 10M/full duplex operation? Thanks. Tauseef Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=34076t=34076 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Cisco 7507 PA-4E full duplex operation [7:34076]
To answer my own question, Cisco added this feature for 7500 Series routers in IOS releases 12.1.9.6E and later. With this release, the interface command to accomplish this task is duplex full. Tauseef Tauseef Nagi wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Cisco states that their PA-4E module (four port 10BaseT) for 7500 Series routers is capable of being configured for full duplex operation. Under the ethernet interface, no full-duplex option available. Also, the command no half-duplex returns Invalid input. Has anyone configured this module for 10M/full duplex operation? Thanks. Tauseef Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=34134t=34076 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Cisco 7507 PA-4E full duplex operation [7:34076]
Maybe with the use of the 'transmit-interface' command. I haven't tried this myself. --- Tauseef Nagi wrote: Cisco states that their PA-4E module (four port 10BaseT) for 7500 Series routers is capable of being configured for full duplex operation. Under the ethernet interface, no full-duplex option available. Also, the command no half-duplex returns Invalid input. Has anyone configured this module for 10M/full duplex operation? Thanks. Tauseef [EMAIL PROTECTED] __ Do You Yahoo!? Great stuff seeking new owners in Yahoo! Auctions! http://auctions.yahoo.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=34148t=34076 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full-duplex Ethernet cable? [7:31643]
or BERT Test Allen May wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Yep...and PIN Number, ACL List, etc. I used to bug instructors by referring to them as Network Interface Card Card's to point out what NIC Card really was ;) Allen - Original Message - From: Patrick Ramsey To: Sent: Friday, January 11, 2002 11:54 AM Subject: RE: full-duplex Ethernet cable? [7:31643] Is NIC Card kinda like a FAT Table? : p Daniel Cotts 01/11/02 12:34PM Unshielded Twisted Pair (UTP) uses two pair (four wires) on pins 12 and 36 of an RJ-45 plug. Whether it runs as full or half duplex is determined by the connected equipment - NIC card, Hub, Switch, router, etc. If Ethernet is running over coax cable then it is limited to half duplex. -Original Message- From: mlh [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:56 AM To: [EMAIL PROTECTED] Subject: full-duplex Ethernet cable? [7:31643] Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31728t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full-duplex Ethernet cable? [7:31643]
By the way, the old timers used to say NIC Center. (Network Information Center Center) Priscilla At 10:54 AM 1/12/02, Jeff Buehler wrote: or BERT Test Allen May wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Yep...and PIN Number, ACL List, etc. I used to bug instructors by referring to them as Network Interface Card Card's to point out what NIC Card really was ;) Allen - Original Message - From: Patrick Ramsey To: Sent: Friday, January 11, 2002 11:54 AM Subject: RE: full-duplex Ethernet cable? [7:31643] Is NIC Card kinda like a FAT Table? : p Daniel Cotts 01/11/02 12:34PM Unshielded Twisted Pair (UTP) uses two pair (four wires) on pins 12 and 36 of an RJ-45 plug. Whether it runs as full or half duplex is determined by the connected equipment - NIC card, Hub, Switch, router, etc. If Ethernet is running over coax cable then it is limited to half duplex. -Original Message- From: mlh [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:56 AM To: [EMAIL PROTECTED] Subject: full-duplex Ethernet cable? [7:31643] Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31736t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
full-duplex Ethernet cable? [7:31643]
Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31643t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full-duplex Ethernet cable? [7:31643]
AFAIK, Ethernet would need 1,2 for transmit and 3,6 for receive (and CSMA\CD if half-duplex). Cable dosen't make a station full or half-duplex, it's the hardware. -- RFC 1149 Compliant. FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: full-duplex Ethernet cable? [7:31643]
Hi mlh, Depends on the speed. 10/100mbps full/half duplex uses two pair of the four pairs in a CAT 5 cable. 1000mbps full/half duplex uses all four pair of a CAT 5 cable. Follow the link for the explanation of full and half duplex. http://www.webopedia.com/TERM/f/full_duplex.html Theoretically in full duplex mode each machine can send and receive on a separate pair thus doubling your bandwidth. For example, 100mbps in full duplex mode could send 100mbps on one pair and receive 100mbps on the other pair at the same time which equals 200mbps. This would mean both devices are sending 100mbps. Full duplex would be a point-to-point connection and nothing in between the two devices. In half duplex mode only one machine can send at anytime. I don't know if I covered it all, please correct me if I am wrong. HTH, Scott -Original Message- From: mlh [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 8:56 AM To: [EMAIL PROTECTED] Subject: full-duplex Ethernet cable? [7:31643] Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31646t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: full-duplex Ethernet cable? [7:31643]
Unshielded Twisted Pair (UTP) uses two pair (four wires) on pins 12 and 36 of an RJ-45 plug. Whether it runs as full or half duplex is determined by the connected equipment - NIC card, Hub, Switch, router, etc. If Ethernet is running over coax cable then it is limited to half duplex. -Original Message- From: mlh [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:56 AM To: [EMAIL PROTECTED] Subject: full-duplex Ethernet cable? [7:31643] Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31649t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full-duplex Ethernet cable? [7:31643]
short answer, no differance Dave mlh wrote: Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 Emotion should reflect reason not guide it Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31653t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: full-duplex Ethernet cable? [7:31643]
Is NIC Card kinda like a FAT Table? : p Daniel Cotts 01/11/02 12:34PM Unshielded Twisted Pair (UTP) uses two pair (four wires) on pins 12 and 36 of an RJ-45 plug. Whether it runs as full or half duplex is determined by the connected equipment - NIC card, Hub, Switch, router, etc. If Ethernet is running over coax cable then it is limited to half duplex. -Original Message- From: mlh [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:56 AM To: [EMAIL PROTECTED] Subject: full-duplex Ethernet cable? [7:31643] Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31654t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full-duplex Ethernet cable? [7:31643]
At 11:56 AM 1/11/02, mlh wrote: how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? 10Base-T and 100Base-T unshielded twisted-pair cabling uses two pairs, for both full duplex and half duplex. There's a transmit pair and a receive pair. A station's transmit pair gets crossed over at the hub or switch to mean receive at the hub or switch. The hub or switch's transmit pair becomes receive at the station. It's not the cabling that distinguishes half-duplex and full-duplex. It's the logical topology, hardware, and configuration. With half-duplex, if a station receives bits on its receive pair while transmitting bits on its transmit pair, this is considered a collision. The station must stop transmitting, back off, and retransmit. A half-duplex network is shared. Every device on the hub (or coax cable) shares the bandwidth and must obey the rules of Carrier Sense Multiple Access, Collision Detect. Listen before sending. Listen while sending to see if another station started sending at the same time and back off if that's the case. Full duplex works on a point-to-point link between a station and a switch. Bandwidth is not shared. In this case, receiving while you are sending it perfectly legitimate. So, to upgrade a network from half-duplex to full-duplex doesn't require new cabling, but it does require a new logical topology and possibly new hardware: switches and Network Interface Cards (NICs) that support full duplex. It also requires that the administrator configure everything for full duplex (or use auto-negotiation which is risky because it's buggy.) Hope that helps. Priscilla Thank you in advance. Regrads, mlh Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31655t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full-duplex Ethernet cable? [7:31643]
Yep...and PIN Number, ACL List, etc. I used to bug instructors by referring to them as Network Interface Card Card's to point out what NIC Card really was ;) Allen - Original Message - From: Patrick Ramsey To: Sent: Friday, January 11, 2002 11:54 AM Subject: RE: full-duplex Ethernet cable? [7:31643] Is NIC Card kinda like a FAT Table? : p Daniel Cotts 01/11/02 12:34PM Unshielded Twisted Pair (UTP) uses two pair (four wires) on pins 12 and 36 of an RJ-45 plug. Whether it runs as full or half duplex is determined by the connected equipment - NIC card, Hub, Switch, router, etc. If Ethernet is running over coax cable then it is limited to half duplex. -Original Message- From: mlh [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:56 AM To: [EMAIL PROTECTED] Subject: full-duplex Ethernet cable? [7:31643] Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31657t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full-duplex Ethernet cable? [7:31643]
I don't know why it irritates me so much...it's really crazy but I can't stand hearing people say NIC Card NIC...NICjust say it!...grin... Allen May 01/11/02 01:36PM Yep...and PIN Number, ACL List, etc. I used to bug instructors by referring to them as Network Interface Card Card's to point out what NIC Card really was ;) Allen - Original Message - From: Patrick Ramsey To: Sent: Friday, January 11, 2002 11:54 AM Subject: RE: full-duplex Ethernet cable? [7:31643] Is NIC Card kinda like a FAT Table? : p Daniel Cotts 01/11/02 12:34PM Unshielded Twisted Pair (UTP) uses two pair (four wires) on pins 12 and 36 of an RJ-45 plug. Whether it runs as full or half duplex is determined by the connected equipment - NIC card, Hub, Switch, router, etc. If Ethernet is running over coax cable then it is limited to half duplex. -Original Message- From: mlh [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:56 AM To: [EMAIL PROTECTED] Subject: full-duplex Ethernet cable? [7:31643] Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31659t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: full-duplex Ethernet cable? [7:31643]
NIC lol Scott -Original Message- From: Patrick Ramsey [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:59 AM To: [EMAIL PROTECTED] Subject: Re: full-duplex Ethernet cable? [7:31643] I don't know why it irritates me so much...it's really crazy but I can't stand hearing people say NIC Card NIC...NICjust say it!...grin... Allen May 01/11/02 01:36PM Yep...and PIN Number, ACL List, etc. I used to bug instructors by referring to them as Network Interface Card Card's to point out what NIC Card really was ;) Allen - Original Message - From: Patrick Ramsey To: Sent: Friday, January 11, 2002 11:54 AM Subject: RE: full-duplex Ethernet cable? [7:31643] Is NIC Card kinda like a FAT Table? : p Daniel Cotts 01/11/02 12:34PM Unshielded Twisted Pair (UTP) uses two pair (four wires) on pins 12 and 36 of an RJ-45 plug. Whether it runs as full or half duplex is determined by the connected equipment - NIC card, Hub, Switch, router, etc. If Ethernet is running over coax cable then it is limited to half duplex. -Original Message- From: mlh [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:56 AM To: [EMAIL PROTECTED] Subject: full-duplex Ethernet cable? [7:31643] Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31661t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full-duplex Ethernet cable? [7:31643]
How about ATM machine? Or local LEC? VIN number? Patrick Ramsey 1/11/02 11:58:52 AM I don't know why it irritates me so much...it's really crazy but I can't stand hearing people say NIC Card NIC...NICjust say it!...grin... Allen May 01/11/02 01:36PM Yep...and PIN Number, ACL List, etc. I used to bug instructors by referring to them as Network Interface Card Card's to point out what NIC Card really was ;) Allen - Original Message - From: Patrick Ramsey To: Sent: Friday, January 11, 2002 11:54 AM Subject: RE: full-duplex Ethernet cable? [7:31643] Is NIC Card kinda like a FAT Table? : p Daniel Cotts 01/11/02 12:34PM Unshielded Twisted Pair (UTP) uses two pair (four wires) on pins 12 and 36 of an RJ-45 plug. Whether it runs as full or half duplex is determined by the connected equipment - NIC card, Hub, Switch, router, etc. If Ethernet is running over coax cable then it is limited to half duplex. -Original Message- From: mlh [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:56 AM To: [EMAIL PROTECTED] Subject: full-duplex Ethernet cable? [7:31643] Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31663t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: full-duplex Ethernet cable? [7:31643]
I can see you are a stable person -Original Message- From: Patrick Ramsey [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 1:59 PM To: [EMAIL PROTECTED] Subject: Re: full-duplex Ethernet cable? [7:31643] I don't know why it irritates me so much...it's really crazy but I can't stand hearing people say NIC Card NIC...NICjust say it!...grin... Allen May 01/11/02 01:36PM Yep...and PIN Number, ACL List, etc. I used to bug instructors by referring to them as Network Interface Card Card's to point out what NIC Card really was ;) Allen - Original Message - From: Patrick Ramsey To: Sent: Friday, January 11, 2002 11:54 AM Subject: RE: full-duplex Ethernet cable? [7:31643] Is NIC Card kinda like a FAT Table? : p Daniel Cotts 01/11/02 12:34PM Unshielded Twisted Pair (UTP) uses two pair (four wires) on pins 12 and 36 of an RJ-45 plug. Whether it runs as full or half duplex is determined by the connected equipment - NIC card, Hub, Switch, router, etc. If Ethernet is running over coax cable then it is limited to half duplex. -Original Message- From: mlh [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:56 AM To: [EMAIL PROTECTED] Subject: full-duplex Ethernet cable? [7:31643] Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31664t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: full-duplex Ethernet cable? [7:31643]
We are the Knights who sayNIC! oh manI really need to get back to work. :-) Scott Nawalaniec 1/11/02 12:13:40 PM NIC lol Scott -Original Message- From: Patrick Ramsey [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:59 AM To: [EMAIL PROTECTED] Subject: Re: full-duplex Ethernet cable? [7:31643] I don't know why it irritates me so much...it's really crazy but I can't stand hearing people say NIC Card NIC...NICjust say it!...grin... Allen May 01/11/02 01:36PM Yep...and PIN Number, ACL List, etc. I used to bug instructors by referring to them as Network Interface Card Card's to point out what NIC Card really was ;) Allen - Original Message - From: Patrick Ramsey To: Sent: Friday, January 11, 2002 11:54 AM Subject: RE: full-duplex Ethernet cable? [7:31643] Is NIC Card kinda like a FAT Table? : p Daniel Cotts 01/11/02 12:34PM Unshielded Twisted Pair (UTP) uses two pair (four wires) on pins 12 and 36 of an RJ-45 plug. Whether it runs as full or half duplex is determined by the connected equipment - NIC card, Hub, Switch, router, etc. If Ethernet is running over coax cable then it is limited to half duplex. -Original Message- From: mlh [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:56 AM To: [EMAIL PROTECTED] Subject: full-duplex Ethernet cable? [7:31643] Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31665t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: full-duplex Ethernet cable? [7:31643]
I did not note a speed associated with that full-duplex Ethernet spec. Wouldn't GigE Cu require all eight? And, might a new cable plant effort be well-served to require all eight conductors per RJ? Best, G. VP OGC -Original Message- From: Allen May [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:40 AM To: [EMAIL PROTECTED] Subject: Re: full-duplex Ethernet cable? [7:31643] Yep...and PIN Number, ACL List, etc. I used to bug instructors by referring to them as Network Interface Card Card's to point out what NIC Card really was ;) Allen - Original Message - From: Patrick Ramsey To: Sent: Friday, January 11, 2002 11:54 AM Subject: RE: full-duplex Ethernet cable? [7:31643] Is NIC Card kinda like a FAT Table? : p Daniel Cotts 01/11/02 12:34PM Unshielded Twisted Pair (UTP) uses two pair (four wires) on pins 12 and 36 of an RJ-45 plug. Whether it runs as full or half duplex is determined by the connected equipment - NIC card, Hub, Switch, router, etc. If Ethernet is running over coax cable then it is limited to half duplex. -Original Message- From: mlh [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:56 AM To: [EMAIL PROTECTED] Subject: full-duplex Ethernet cable? [7:31643] Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31667t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full-duplex Ethernet cable? [7:31643]
me and a buddy came up with close to 20 one extremely boring night! I'm not sure which is worse...being the one who says it or being obsessed with telling people to stop saying it! ha -Patrick John Neiberger 01/11/02 02:27PM How about ATM machine? Or local LEC? VIN number? Patrick Ramsey 1/11/02 11:58:52 AM I don't know why it irritates me so much...it's really crazy but I can't stand hearing people say NIC Card NIC...NICjust say it!...grin... Allen May 01/11/02 01:36PM Yep...and PIN Number, ACL List, etc. I used to bug instructors by referring to them as Network Interface Card Card's to point out what NIC Card really was ;) Allen - Original Message - From: Patrick Ramsey To: Sent: Friday, January 11, 2002 11:54 AM Subject: RE: full-duplex Ethernet cable? [7:31643] Is NIC Card kinda like a FAT Table? : p Daniel Cotts 01/11/02 12:34PM Unshielded Twisted Pair (UTP) uses two pair (four wires) on pins 12 and 36 of an RJ-45 plug. Whether it runs as full or half duplex is determined by the connected equipment - NIC card, Hub, Switch, router, etc. If Ethernet is running over coax cable then it is limited to half duplex. -Original Message- From: mlh [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:56 AM To: [EMAIL PROTECTED] Subject: full-duplex Ethernet cable? [7:31643] Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31670t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full-duplex Ethernet cable? [7:31643]
It is true that 10Base-T and 100Base-T unshielded twisted-pair cabling uses two pairs, both full duplex and half duplex. It is true that It's not the cabling that distinguishes half-duplex and full-duplex. It's the logical topology, hardware, and configuration. But, if you want to run 100Base-T and full-duplex depend you must take care on the cable4s length and quality. It functions better if you have CAT-5 or CAT-5E cable. - Original Message - From: Priscilla Oppenheimer To: Sent: Friday, January 11, 2002 9:59 AM Subject: Re: full-duplex Ethernet cable? [7:31643] At 11:56 AM 1/11/02, mlh wrote: how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? 10Base-T and 100Base-T unshielded twisted-pair cabling uses two pairs, for both full duplex and half duplex. There's a transmit pair and a receive pair. A station's transmit pair gets crossed over at the hub or switch to mean receive at the hub or switch. The hub or switch's transmit pair becomes receive at the station. It's not the cabling that distinguishes half-duplex and full-duplex. It's the logical topology, hardware, and configuration. With half-duplex, if a station receives bits on its receive pair while transmitting bits on its transmit pair, this is considered a collision. The station must stop transmitting, back off, and retransmit. A half-duplex network is shared. Every device on the hub (or coax cable) shares the bandwidth and must obey the rules of Carrier Sense Multiple Access, Collision Detect. Listen before sending. Listen while sending to see if another station started sending at the same time and back off if that's the case. Full duplex works on a point-to-point link between a station and a switch. Bandwidth is not shared. In this case, receiving while you are sending it perfectly legitimate. So, to upgrade a network from half-duplex to full-duplex doesn't require new cabling, but it does require a new logical topology and possibly new hardware: switches and Network Interface Cards (NICs) that support full duplex. It also requires that the administrator configure everything for full duplex (or use auto-negotiation which is risky because it's buggy.) Hope that helps. Priscilla Thank you in advance. Regrads, mlh Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31676t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: full-duplex Ethernet cable? [7:31643]
John Neiberger raved, We are the Knights who sayNIC! oh manI really need to get back to work. :-) No, John. You need a shrubbery. Scott Nawalaniec 1/11/02 12:13:40 PM NIC lol Scott -Original Message- From: Patrick Ramsey [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:59 AM To: [EMAIL PROTECTED] Subject: Re: full-duplex Ethernet cable? [7:31643] I don't know why it irritates me so much...it's really crazy but I can't stand hearing people say NIC Card NIC...NICjust say it!...grin... Allen May 01/11/02 01:36PM Yep...and PIN Number, ACL List, etc. I used to bug instructors by referring to them as Network Interface Card Card's to point out what NIC Card really was ;) Allen - Original Message - From: Patrick Ramsey To: Sent: Friday, January 11, 2002 11:54 AM Subject: RE: full-duplex Ethernet cable? [7:31643] Is NIC Card kinda like a FAT Table? : p Daniel Cotts 01/11/02 12:34PM Unshielded Twisted Pair (UTP) uses two pair (four wires) on pins 12 and 36 of an RJ-45 plug. Whether it runs as full or half duplex is determined by the connected equipment - NIC card, Hub, Switch, router, etc. If Ethernet is running over coax cable then it is limited to half duplex. -Original Message- From: mlh [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:56 AM To: [EMAIL PROTECTED] Subject: full-duplex Ethernet cable? [7:31643] Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31681t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full-duplex Ethernet cable? [7:31643]
At 03:20 PM 1/11/02, Joseba Izaga wrote: It is true that 10Base-T and 100Base-T unshielded twisted-pair cabling uses two pairs, both full duplex and half duplex. It is true that It's not the cabling that distinguishes half-duplex and full-duplex. It's the logical topology, hardware, and configuration. But, if you want to run 100Base-T and full-duplex depend you must take care on the cable4s length and quality. It functions better if you have CAT-5 or CAT-5E cable. That statement applies if you want to run 100Base-T with half duplex also. In fact, 100Base-TX requires Cat 5 or better. I just checked the standard. 10Base-T, on the other hand, does not say that. He asked about cabling requirements for half versus full. He didn't ask about cabling requirements for 10 Mbps versus 100 Mbps. Priscilla - Original Message - From: Priscilla Oppenheimer To: Sent: Friday, January 11, 2002 9:59 AM Subject: Re: full-duplex Ethernet cable? [7:31643] At 11:56 AM 1/11/02, mlh wrote: how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? 10Base-T and 100Base-T unshielded twisted-pair cabling uses two pairs, for both full duplex and half duplex. There's a transmit pair and a receive pair. A station's transmit pair gets crossed over at the hub or switch to mean receive at the hub or switch. The hub or switch's transmit pair becomes receive at the station. It's not the cabling that distinguishes half-duplex and full-duplex. It's the logical topology, hardware, and configuration. With half-duplex, if a station receives bits on its receive pair while transmitting bits on its transmit pair, this is considered a collision. The station must stop transmitting, back off, and retransmit. A half-duplex network is shared. Every device on the hub (or coax cable) shares the bandwidth and must obey the rules of Carrier Sense Multiple Access, Collision Detect. Listen before sending. Listen while sending to see if another station started sending at the same time and back off if that's the case. Full duplex works on a point-to-point link between a station and a switch. Bandwidth is not shared. In this case, receiving while you are sending it perfectly legitimate. So, to upgrade a network from half-duplex to full-duplex doesn't require new cabling, but it does require a new logical topology and possibly new hardware: switches and Network Interface Cards (NICs) that support full duplex. It also requires that the administrator configure everything for full duplex (or use auto-negotiation which is risky because it's buggy.) Hope that helps. Priscilla Thank you in advance. Regrads, mlh Priscilla Oppenheimer http://www.priscilla.com Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31683t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: full-duplex Ethernet cable? [7:31643]
Yes, or TCP/IP Protocol for that matter. -Original Message- From: Patrick Ramsey [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 11:54 AM To: [EMAIL PROTECTED] Subject: RE: full-duplex Ethernet cable? [7:31643] Is NIC Card kinda like a FAT Table? : p Daniel Cotts 01/11/02 12:34PM Unshielded Twisted Pair (UTP) uses two pair (four wires) on pins 12 and 36 of an RJ-45 plug. Whether it runs as full or half duplex is determined by the connected equipment - NIC card, Hub, Switch, router, etc. If Ethernet is running over coax cable then it is limited to half duplex. -Original Message- From: mlh [mailto:[EMAIL PROTECTED]] Sent: Friday, January 11, 2002 10:56 AM To: [EMAIL PROTECTED] Subject: full-duplex Ethernet cable? [7:31643] Hi, there, how many pairs of two-twisted cable are used for full-duplex Ethernet ? what is the difference between full- and half- duplex cable? Thank you in advance. Regrads, mlh Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=31682t=31643 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Cisco 7960 phones and full duplex [7:8989]
I haven't been around much lately or had time to read much, but I still like to post odd tid-bits that I run into. Cisco 7960 IP phones (probably all of the 79xx line) can run 100mbit full-duplex. However, they will not run full-duplex on a Catalyst 4006 48-port inline power blades *if* you set the port to 100/full, disabling auto-negotiation. Does this occur with other switches? No time to troubleshoot it. What I did observe is that the switch will report a duplex mismatch, and the phone itself will show running half-duplex. However, simply setting the Cat4K port back to speed auto allows the phone to run 100/full (most be something in its limited capacity where it must negotiate, and if it doesn't it just falls back to half-duplex). Here's a Cisco URL confirming they run 100/full (which is what prompted me to set it back to auto): http://www.cisco.com/univercd/cc/td/doc/product/voice/c_ipphon/7900/admingd/7900set.htm TTFN, Jason Roysdon, CCNP+Security/CCDP, MCSE, CNA, Network+, A+ List email: [EMAIL PROTECTED] Homepage: http://jason.artoo.net/ Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=8989t=8989 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
2600 Ethernet Full Duplex [7:8608]
I finally found a single reference after a *lot* of searching on CCO that indicates in 12.0(4)T, full duplex capability was added to ethernet interfaces on the 2600 and 3600 platforms. I found this in a list of caveats that mentioned a situation where this would not work even though it was supposed to. I found no other reference anywhere that mentioned this was possible. This actually makes me pretty happy because I upgraded a 2611 a while back and it would help us out greatly if those ports could do full duplex. To the person who pointed this out, I thank you! John Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=8608t=8608 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
10mbit full duplex? [7:6176]
(Trying yet again, this time from the web interface): I think my posts are being eaten (usually they show up right away), and perhaps Paul has a filter on the word Test (but I doubt it as there seems to be a number of those posts). Anyway, I was setting the 2610 back to half-duplex, then got distracted before I could set the Catalyst back (it was still on full-duplex) and received this error on the 2610 when I returned: May 28 20:18:46.243 PDT: %AMDP2_FE-5-LATECOLL: Ethernet0/0 transmit error Drawing from this, I'm guessing somehow the 2610 e0/0 was really running full-duplex before. Here's the original post (which doesn't look like it ever made it): Odd situation that I'm dinking around with in my lab (actually stalling from getting on with the real IDS lab I should be working on). 2610 router with a 10mbit ethernet port connected to a Catalyst 3524 10/100mbit port. I've configured both sides for 10mbit and full-duplex and brought them out of no shut mode at the same time, cleared counters, and then started up a 100K packets, 1450 bit size, 0 second timeout from another 10mbit router (1605R) also connected to the Catalyst (only running 10/half, though). With that ping session going, here are some of the results: Cat3524b_jroysdon# Cat3524b_jroysdon#sh int f0/22 FastEthernet0/22 is up, line protocol is up Hardware is Fast Ethernet, address is 0004.27dc.6196 (bia 0004.27dc.6196) Description: 2610 e0/0 MTU 1500 bytes, BW 1 Kbit, DLY 1000 usec, reliability 255/255, txload 66/255, rxload 66/255 Encapsulation ARPA, loopback not set Keepalive not set Full-duplex, 10Mb/s, 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:08, output 00:00:00, output hang never Last clearing of show interface counters 00:04:32 Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 30 second input rate 2622000 bits/sec, 225 packets/sec 30 second output rate 2623000 bits/sec, 226 packets/sec 29741 packets input, 43430219 bytes Received 93 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 watchdog, 93 multicast 0 input packets with dribble condition detected 29771 packets output, 43454247 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out Cat3524b_jroysdon#sh cdp neigh det - Device ID: c2610_jroysdon.internal.artoo.net Entry address(es): IP address: 192.168.45.252 Platform: cisco 2610, Capabilities: Router Interface: FastEthernet0/22, Port ID (outgoing port): Ethernet0/0 Holdtime : 161 sec Version : Cisco Internetwork Operating System Software IOS (tm) C2600 Software (C2600-JK9O3S-M), Version 12.2(1), RELEASE SOFTWARE (fc2) Copyright (c) 1986-2001 by cisco Systems, Inc. Compiled Fri 27-Apr-01 16:36 by cmong advertisement version: 2 Duplex: half Cat3524b_jroysdon# *Mar 3 00:24:20.250 PST: %CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on FastEthern et0/22 (not half duplex), with c2610_jroysdon.internal.artoo.net Ethernet0/0 (half duplex) / c2610_jroysdon#sh int e0/0 Ethernet0/0 is up, line protocol is up Hardware is AmdP2, address is 0003.e39b.5cc0 (bia 0003.e39b.5cc0) Internet address is 192.168.45.252/24 MTU 1500 bytes, BW 1 Kbit, DLY 1000 usec, reliability 255/255, txload 24/255, rxload 24/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec) ARP type: ARPA, ARP Timeout 04:00:00 Last input 00:00:00, output 00:00:00, output hang never Last clearing of show interface counters 00:04:30 Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 14/75, 0 drops 5 minute input rate 968000 bits/sec, 100 packets/sec 5 minute output rate 967000 bits/sec, 100 packets/sec 30061 packets input, 43689271 bytes, 0 no buffer Received 147 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored 0 input packets with dribble condition detected 29959 packets output, 43659032 bytes, 0 underruns(0/0/0) 0 output errors, 0 collisions, 0 interface resets 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers swapped out c2610_jroysdon# sh cdp neigh det - Device ID: Cat3524b_jroysdon.internal.artoo.net Entry address(es): IP address: 192.168.43.2 Platform: cisco WS-C3524-PWR-XL, Capabilities: Trans-Bridge Switch Interface: Ethernet0/0, Port ID (outgoing port): FastEthernet0/22 Holdtime : 143 sec Version : Cisco Internetwork Operating System Software IOS (tm) C3500XL Software (C3500XL-C3H2S-M), Version 12.0(5.2)XU, MAINTENANCE INTERIM SOFT WARE Copyright (c) 1986-2000 by cisco Systems, Inc. Compiled Mon 17-Jul-00 18:29
Full duplex and a hub
Hi ALL, a fast Ether port on a cisco switch (2900XL) connected to a hub (3com repeater) 10/100 port reports auto-negotiated full-duplex, and works fine. How can a normal hub (no buffering!) accept full-duplex? To my undestanding this is impossible... Am I wrong? And, is there a simple way to check the duplex mode of a line by some IOS-independent method? Thanks. Alex == _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Full duplex and a hub
some 3com models include an optional uplink module which function as a
switching port... are you refering to the port?
you can use: show port capabilities {port}
correct me if i am wrong...
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Sasha
Sent: Wednesday, March 14, 2001 5:24 PM
To: [EMAIL PROTECTED]
Subject: Full duplex and a hub
Hi ALL,
a fast Ether port on a cisco switch (2900XL)
connected to a hub (3com repeater) 10/100 port
reports auto-negotiated full-duplex, and works fine.
How can a normal hub (no buffering!) accept full-duplex?
To my undestanding this is impossible...
Am I wrong?
And, is there a simple way to check the duplex mode
of a line by some IOS-independent method?
Thanks.
Alex
==
_
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RE: Full duplex and a hub
oops sorry should be: show port {port}
to check the speed.
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Sasha
Sent: Wednesday, March 14, 2001 5:24 PM
To: [EMAIL PROTECTED]
Subject: Full duplex and a hub
Hi ALL,
a fast Ether port on a cisco switch (2900XL)
connected to a hub (3com repeater) 10/100 port
reports auto-negotiated full-duplex, and works fine.
How can a normal hub (no buffering!) accept full-duplex?
To my undestanding this is impossible...
Am I wrong?
And, is there a simple way to check the duplex mode
of a line by some IOS-independent method?
Thanks.
Alex
==
_
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http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
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Re: Full duplex and a hub
Never seen that on a hub (hubs should of course not work with duplex) However, I have seen this 'faking full-duplex' in other situations. Lights on the switch (and the routers) indicated full duplex but data transfers (in different directions at the same time) seemed slow. I cleared the counters on the interfaces then inititiated massive transfers in both directions. This was to see if any collisions showed up in "sh int" (indicating that the full-duplex lights were 'full of it' [to use a tech term]). The collision count soared. Cisco confirmed that this was an effective (albeit screwy) way to confirm duplex status (or the lack thereof) notwithstanding the status lights. Although that test is not IOS-independent, it should work. My cure was to upgrade the IOS on the routers. From: "Sasha" [EMAIL PROTECTED] Reply-To: "Sasha" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Full duplex and a hub Date: Wed, 14 Mar 2001 10:24:19 +0100 Hi ALL, a fast Ether port on a cisco switch (2900XL) connected to a hub (3com repeater) 10/100 port reports auto-negotiated full-duplex, and works fine. How can a normal hub (no buffering!) accept full-duplex? To my undestanding this is impossible... Am I wrong? And, is there a simple way to check the duplex mode of a line by some IOS-independent method? Thanks. Alex == _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ Get your FREE download of MSN Explorer at http://explorer.msn.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full duplex and a hub
Hi ALL, a fast Ether port on a cisco switch (2900XL) connected to a hub (3com repeater) 10/100 port reports auto-negotiated full-duplex, and works fine. How can a normal hub (no buffering!) accept full-duplex? To my undestanding this is impossible... Am I wrong? The real problem here is that "hub" is a marketing, not a technical, term. In most technical discussions, what we mean by an Ethernet hub is a multiport repeater. If the 3Com device were defined as a multiport repeater, what you say would be completely true. Unfortunately, different vendors use "hub" in different ways. Cisco, actually, has been cleaner than most. When Cisco puts a capability into a "hub" that flatly is beyond the functionality of a multiport repeater, they tend to identify that as a distinct function, and often put that on a separate module. A good example of that is speed switching. Cabletron, as an example, tends to define "hub" as a shelf into which repeater, bridge/LAN switch, and router modules can plug. I can't say they strictly are wrong to do so, because there is no standard definition of hub. Their definition is more a logical one that it is a hubbing point for wiring, rather than phrased in terms of what happens to the bits on the wire. Interestingly, until Cabletron and Cisco got into a rather nasty and public licensing fight several years ago, Cabletron was quite possibly Cisco's largest customer for card-level IGS routers used in their hubs, and carrying a Cabletron part number. Not sure if Cabletron (or its successor companies) now makes its own router cards, or, if not, from whome they OEM them. My impression is that 3Com uses the term hub in a way fairly consistent with Cabletron. -- "What Problem are you trying to solve?" ***send Cisco questions to the list, so all can benefit -- not directly to me*** Howard C. Berkowitz [EMAIL PROTECTED] Technical Director, CertificationZone.com Senior Mgr. IP Protocols Algorithms, Advanced Technology Investments, NortelNetworks (for ID only) but Cisco stockholder! "retired" Certified Cisco Systems Instructor (CID) #93005 _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full duplex and a hub
From: "Howard C. Berkowitz" [EMAIL PROTECTED] Reply-To: "Howard C. Berkowitz" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: Full duplex and a hub Date: Wed, 14 Mar 2001 09:09:46 -0500 Snip Interestingly, until Cabletron and Cisco got into a rather nasty and public licensing fight several years ago, Cabletron was quite possibly Cisco's largest customer for card-level IGS routers used in their hubs, and carrying a Cabletron part number. Not sure if Cabletron (or its successor companies) now makes its own router cards, or, if not, from whome they OEM them. ACC (Now Ericsson) I believe. Rob./ _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full duplex and a hub
Indeed, 3COM has a product called "full-duplex repeater" (what a name...). This is actually a hybrid of a switch and a repeater: it uses buffering of incoming frames and a round-robin method of forwarding them to all egress ports. However, my question concerns the common device -- no buffering. How can the port controller on cisco claim it is in full-duplex while it is in half? Is it possible that 3COM "emulates" full-duplex during autonegotiation, and, if yes, what for? == ""Howard C. Berkowitz"" [EMAIL PROTECTED] escribió en el mensaje news:p0500190eb6d52a4dc981@[63.216.127.100]... Hi ALL, a fast Ether port on a cisco switch (2900XL) connected to a hub (3com repeater) 10/100 port reports auto-negotiated full-duplex, and works fine. How can a normal hub (no buffering!) accept full-duplex? To my undestanding this is impossible... Am I wrong? The real problem here is that "hub" is a marketing, not a technical, term. In most technical discussions, what we mean by an Ethernet hub is a multiport repeater. If the 3Com device were defined as a multiport repeater, what you say would be completely true. Unfortunately, different vendors use "hub" in different ways. Cisco, actually, has been cleaner than most. When Cisco puts a capability into a "hub" that flatly is beyond the functionality of a multiport repeater, they tend to identify that as a distinct function, and often put that on a separate module. A good example of that is speed switching. Cabletron, as an example, tends to define "hub" as a shelf into which repeater, bridge/LAN switch, and router modules can plug. I can't say they strictly are wrong to do so, because there is no standard definition of hub. Their definition is more a logical one that it is a hubbing point for wiring, rather than phrased in terms of what happens to the bits on the wire. Interestingly, until Cabletron and Cisco got into a rather nasty and public licensing fight several years ago, Cabletron was quite possibly Cisco's largest customer for card-level IGS routers used in their hubs, and carrying a Cabletron part number. Not sure if Cabletron (or its successor companies) now makes its own router cards, or, if not, from whome they OEM them. My impression is that 3Com uses the term hub in a way fairly consistent with Cabletron. -- "What Problem are you trying to solve?" ***send Cisco questions to the list, so all can benefit -- not directly to me*** Howard C. Berkowitz [EMAIL PROTECTED] Technical Director, CertificationZone.com Senior Mgr. IP Protocols Algorithms, Advanced Technology Investments, NortelNetworks (for ID only) but Cisco stockholder! "retired" Certified Cisco Systems Instructor (CID) #93005 _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Serial port Full Duplex or Half duplex?
Hi, Best look at Full Duplex and what it means. I think either could be a more appropriate answer. Depending on the device connecting to the serial port. Most devices you connect to a V.35 interface will indeed run at full duplex. Dulpex is not an ethernet thing but a comms thing that allows a connection to transmit on one cct and receive on another. It might use some form of modulation to separate one cct from another or could use a 4 wire connection as in ethernet as long as both circuits are separated. Just some thoughts, Teunis Hobart, Tasmania Australia On Thursday, February 08, 2001 at 04:59:05 PM, Circusnuts wrote: neither- I can't think of any type Serial interfaces that pay much attention to Ethernet duplex :o) If you meant Ethernet, I don't know that I have ever seen that ability on the routers (switches yes)... Phil - Original Message - From: "Kiran Kumar M" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Thursday, March 08, 2001 4:56 PM Subject: Serial port Full Duplex or Half duplex? Hi, Can anyone tell me In cisco routers, serial interface with v.35 will work in Full Deuplex or Half Duplex? Thanks, Kiran _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] -- www.tasmail.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Serial port Full Duplex or Half duplex?
Ok Ok- ya got me... Of course V.35, RS-232, RS-449, Multimode, etc., etc. are used to support Full Duplex transmissions. Maybe it was BSMCN on the brain. As my old Uncle Olauff used to day "this problem is seemingly obvious to the casual observer :o) Phil - Original Message - From: "Tony van Ree" [EMAIL PROTECTED] To: "Circusnuts" [EMAIL PROTECTED]; "Kiran Kumar M" [EMAIL PROTECTED]; [EMAIL PROTECTED] Sent: Monday, March 12, 2001 12:54 AM Subject: Re: Serial port Full Duplex or Half duplex? Hi, Best look at Full Duplex and what it means. I think either could be a more appropriate answer. Depending on the device connecting to the serial port. Most devices you connect to a V.35 interface will indeed run at full duplex. Dulpex is not an ethernet thing but a comms thing that allows a connection to transmit on one cct and receive on another. It might use some form of modulation to separate one cct from another or could use a 4 wire connection as in ethernet as long as both circuits are separated. Just some thoughts, Teunis Hobart, Tasmania Australia On Thursday, February 08, 2001 at 04:59:05 PM, Circusnuts wrote: neither- I can't think of any type Serial interfaces that pay much attention to Ethernet duplex :o) If you meant Ethernet, I don't know that I have ever seen that ability on the routers (switches yes)... Phil - Original Message - From: "Kiran Kumar M" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Thursday, March 08, 2001 4:56 PM Subject: Serial port Full Duplex or Half duplex? Hi, Can anyone tell me In cisco routers, serial interface with v.35 will work in Full Deuplex or Half Duplex? Thanks, Kiran _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] -- www.tasmail.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Serial port Full Duplex or Half duplex?
Hi, Can anyone tell me In cisco routers, serial interface with v.35 will work in Full Deuplex or Half Duplex? Thanks, Kiran _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Serial port Full Duplex or Half duplex?
neither- I can't think of any type Serial interfaces that pay much attention to Ethernet duplex :o) If you meant Ethernet, I don't know that I have ever seen that ability on the routers (switches yes)... Phil - Original Message - From: "Kiran Kumar M" [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Thursday, March 08, 2001 4:56 PM Subject: Serial port Full Duplex or Half duplex? Hi, Can anyone tell me In cisco routers, serial interface with v.35 will work in Full Deuplex or Half Duplex? Thanks, Kiran _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Serial port Full Duplex or Half duplex?
Kiran, It depends on the protocol that you run over the serial interface. By default, synchronous serial interfaces operate in full-duplex mode . However, the usage of certain protocols changes that default to half-duplex. More info here: http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/inter_c/icserint.htm Keep in mind that the V.35 interface is relatively low speed (up to 48Kbps) and is recommended for use with packet networks rather than cell-switched networks (Frame-Relay, SMDS rather than ATM) so checking out he HSSI info won't do you much good. Hope this helps, Karen Young *** REPLY SEPARATOR *** On 3/9/2001 at 12:26 AM Kiran Kumar M wrote: Hi, Can anyone tell me In cisco routers, serial interface with v.35 will work in Full Deuplex or Half Duplex? Thanks, Kiran _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Serial port Full Duplex or Half duplex?
My understanding is that serial is full duplex. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Kiran Kumar M Sent: Thursday, March 08, 2001 1:57 PM To: [EMAIL PROTECTED] Subject: Serial port Full Duplex or Half duplex? Hi, Can anyone tell me In cisco routers, serial interface with v.35 will work in Full Deuplex or Half Duplex? Thanks, Kiran _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full Duplex Hub?
To all who responded, thank you.=20 Mark - that's one (of my no doubt many) points of confusion. I know a = switch breaks up collision domains and a hub is shared media, therefore = one collision domain. I also know that the NIC set to 100 means nothing = as far as half or full duplex goes, as you can run 100 in either. I've = searched around - trying Cogent's site though I think they are out of = business - even reading and rereading Charles Spurgeon's Ethernet - The = Definitive Guide. Yeah, I know, there's reading and there's the real = world, I just wanted to check if my logic was correct. No where do I see = anything about 100 Full Duplex hubs. Switches, sure, that's their reason = for living for the most part. I have found some writings on the web = saying that with certain "proprietary" (read - not based on the Ethernet = Standard) hubs will run at 100 Full Duplex. What I haven't found is WHY = or HOW they can do this.=20 Gene - yes that makes sense, but how do the NIC's decide to run half = duplex if I've forced them to full? (I avoid auto-negotiate like the = plague)?=20 David - Exactly my understanding. Collision detection is turned off at = full duplex, so how in the hell is this thing working? I suspect the = answer lies in the hardware specs (clever, aren't I?) but since I can't = find them I'm bumbling around blindly. Anyway, thanks for all the responses, it helps to no I wasn't entirely = crazy...regarding this at least. Thanks again Patrick "Mark Holloway" [EMAIL PROTECTED] wrote in message = 97poso$m4e$[EMAIL PROTECTED]">news:97poso$m4e$[EMAIL PROTECTED]... Well, a full duplex hub is typically called a switch. Just because = the NICs are at 100 Full doesn't mean anything. Many times devices can be set = for auto negotiate and not configure properly. You can force a setting on = a NIC and even if it wrong, it will still work, but there may be errors and retransmissions will occur. If you only have two devices in this hub = and they are only talking to each other, there may not be any collisions. =20 Regards, Mark =20 ""Patrick McAllister"" [EMAIL PROTECTED] wrote in message 007201c0a383$7e2ff7d0$6401a8c0@cartman">news:007201c0a383$7e2ff7d0$6401a8c0@cartman... I know this isn't a Cisco question per se, and I apologize in = advance.=3D20 Is there such a thing as a full duplex 100BaseTx hub or repeater? I = =3D thought all hubs/repeaters had to run in half duplex. Here's the scenario, of sorts. I have a Cogent 1200 100Base TX Class = I =3D Repeater. I hook two PC's up to them and start transferring files. = =3D Everything works swimmingly. I look at the config after I'm done and = =3D both NIC's in the PC's are set to full duplex. There is (of course) = no =3D setting on the Cogent, and there is (of course) a collision light, = but =3D it never flashed during the transfer. I know I'm not the sharpest = knife =3D in the drawer, I accept that. But have I been laboring under a =3D misconception all this time?=3D20 _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to = [EMAIL PROTECTED] =20 =20 _ FAQ, list archives, and subscription info: = http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Full Duplex Hub?
I know this isn't a Cisco question per se, and I apologize in advance.=20 Is there such a thing as a full duplex 100BaseTx hub or repeater? I = thought all hubs/repeaters had to run in half duplex. Here's the scenario, of sorts. I have a Cogent 1200 100Base TX Class I = Repeater. I hook two PC's up to them and start transferring files. = Everything works swimmingly. I look at the config after I'm done and = both NIC's in the PC's are set to full duplex. There is (of course) no = setting on the Cogent, and there is (of course) a collision light, but = it never flashed during the transfer. I know I'm not the sharpest knife = in the drawer, I accept that. But have I been laboring under a = misconception all this time?=20 _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full Duplex Hub?
Well, a full duplex hub is typically called a switch. Just because the NICs are at 100 Full doesn't mean anything. Many times devices can be set for auto negotiate and not configure properly. You can force a setting on a NIC and even if it wrong, it will still work, but there may be errors and retransmissions will occur. If you only have two devices in this hub and they are only talking to each other, there may not be any collisions. Regards, Mark ""Patrick McAllister"" [EMAIL PROTECTED] wrote in message 007201c0a383$7e2ff7d0$6401a8c0@cartman">news:007201c0a383$7e2ff7d0$6401a8c0@cartman... I know this isn't a Cisco question per se, and I apologize in advance.=20 Is there such a thing as a full duplex 100BaseTx hub or repeater? I = thought all hubs/repeaters had to run in half duplex. Here's the scenario, of sorts. I have a Cogent 1200 100Base TX Class I = Repeater. I hook two PC's up to them and start transferring files. = Everything works swimmingly. I look at the config after I'm done and = both NIC's in the PC's are set to full duplex. There is (of course) no = setting on the Cogent, and there is (of course) a collision light, but = it never flashed during the transfer. I know I'm not the sharpest knife = in the drawer, I accept that. But have I been laboring under a = misconception all this time?=20 _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full Duplex
To complicate things more, doesn't it really transmit at about 125 mbs in
both directions at the physical layer... but with the 4/5 encoding you only
end up seeing 100 mbs being transferred in each direction.
- Original Message -
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Thursday, February 22, 2001 4:52 PM
Subject: Re: Full Duplex
Yes, you can certainly get more than 100mb total throughput, if you add
the
two directions together. But you can still only get 100 mb in either
direction, even if there's no traffic in one direction. It's really a
matter of semantics. Marketing types like to add both directions together
and claim that as the bandwidth, because they can claim a higher bandwidth
that way. But in my opinion it's more useful to say it's 100 mb full
duplex, and that tends to still be the standard, particularly for serial
links.
JMcL
-- Forwarded by Jenny Mcleod/NSO/CSDA on 23/02/2001
08:46 am ---
"AndyD" [EMAIL PROTECTED]@groupstudy.com on 22/02/2001 03:01:21 pm
Please respond to "AndyD" [EMAIL PROTECTED]
Sent by: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
cc:
Subject: Re: Full Duplex
So on a full-duplex 100 mb ethernet link you could theoretically get 200
mbps throughput?? I have had this argument with several people before. I
thought that 100 mb each direction being possible, if both parties
transmit
at the same time but in different directions, you still have 200 mb of
throughput. They all thought I was crazy - said you can't possibly get
more
than 100 mbps out of a 100 mb link.
""Santosh Koshy"" [EMAIL PROTECTED] wrote in message
970klv$f2n$[EMAIL PROTECTED]">news:970klv$f2n$[EMAIL PROTECTED]...
Hi akshay,
If its full duplex you will get 2Mbs of transmit bandwith 2Mbs
of
receive traffic... In a half duplex link you will get a total of 2mbs
for
transmit and receive.
hope the above helps,
Santosh Koshy
""Network Operations"" [EMAIL PROTECTED] wrote in message
9706m3$ouv$[EMAIL PROTECTED]">news:9706m3$ouv$[EMAIL PROTECTED]...
The 2Mbps link i had mentioned is a serial link (E1) not an ethernet
link.
regards
akshay
--
Network Operations (Mumbai)
Bharti BT Internet Ltd.
Tel:- 91-22-6127242
91-22-6127179
Email :- [EMAIL PROTECTED]
"dark_baby" [EMAIL PROTECTED] wrote in message
96vudv$dqr$[EMAIL PROTECTED]">news:96vudv$dqr$[EMAIL PROTECTED]...
Yes. You'll get 2M Transmit 2M REceive(4M) between AB with full
duplex.
With half duplex transfer rate is poor, it is about 1M or less.
You can imply full duplex only with switch, or just host to host
link.
With
hub, you can only use half duplex , because each station must detect
collision before transfer, full duplex doesn't detect
collision(There
is
no
collision with full duplex).
_
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http://www.groupstudy.com/list/cisco.html
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Re: Full Duplex
You can argue about semantics all day long but what matters is the actual
performance difference when running full-duplex. I was troubleshooting why
my LTO tape drive wasn't performing as promised. While investigation I
noticed a large number of collisions on a port on a 3524 ( a port connecting
another switch, backup traffic was going from one switch to the other). I
manually set the duplex to full - all collisions stopped and my backups
improved tremendously! Cisco recommends running ports in a full-duplex mode
especially in server farms.
ex. http://www.cisco.com/warp/public/cc/so/neso/lnso/lnmnso/fesol_wp.htm
""AndyD"" [EMAIL PROTECTED] wrote in message
9726tq$fj7$[EMAIL PROTECTED]">news:9726tq$fj7$[EMAIL PROTECTED]...
So on a full-duplex 100 mb ethernet link you could theoretically get 200
mbps throughput?? I have had this argument with several people before. I
thought that 100 mb each direction being possible, if both parties
transmit
at the same time but in different directions, you still have 200 mb of
throughput. They all thought I was crazy - said you can't possibly get
more
than 100 mbps out of a 100 mb link.
""Santosh Koshy"" [EMAIL PROTECTED] wrote in message
970klv$f2n$[EMAIL PROTECTED]">news:970klv$f2n$[EMAIL PROTECTED]...
Hi akshay,
If its full duplex you will get 2Mbs of transmit bandwith 2Mbs
of
receive traffic... In a half duplex link you will get a total of 2mbs
for
transmit and receive.
hope the above helps,
Santosh Koshy
""Network Operations"" [EMAIL PROTECTED] wrote in message
9706m3$ouv$[EMAIL PROTECTED]">news:9706m3$ouv$[EMAIL PROTECTED]...
The 2Mbps link i had mentioned is a serial link (E1) not an ethernet
link.
regards
akshay
--
Network Operations (Mumbai)
Bharti BT Internet Ltd.
Tel:- 91-22-6127242
91-22-6127179
Email :- [EMAIL PROTECTED]
"dark_baby" [EMAIL PROTECTED] wrote in message
96vudv$dqr$[EMAIL PROTECTED]">news:96vudv$dqr$[EMAIL PROTECTED]...
Yes. You'll get 2M Transmit 2M REceive(4M) between AB with full
duplex.
With half duplex transfer rate is poor, it is about 1M or less.
You can imply full duplex only with switch, or just host to host
link.
With
hub, you can only use half duplex , because each station must detect
collision before transfer, full duplex doesn't detect
collision(There
is
no
collision with full duplex).
_
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http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to
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Re: Full Duplex
Yes, hence the full-duplex.
tv
- Original Message -
From: "AndyD" [EMAIL PROTECTED]
Newsgroups: groupstudy.cisco
To: [EMAIL PROTECTED]
Sent: Wednesday, February 21, 2001 10:01 PM
Subject: Re: Full Duplex
So on a full-duplex 100 mb ethernet link you could theoretically get 200
mbps throughput?? I have had this argument with several people before. I
thought that 100 mb each direction being possible, if both parties
transmit
at the same time but in different directions, you still have 200 mb of
throughput. They all thought I was crazy - said you can't possibly get
more
than 100 mbps out of a 100 mb link.
""Santosh Koshy"" [EMAIL PROTECTED] wrote in message
970klv$f2n$[EMAIL PROTECTED]">news:970klv$f2n$[EMAIL PROTECTED]...
Hi akshay,
If its full duplex you will get 2Mbs of transmit bandwith 2Mbs
of
receive traffic... In a half duplex link you will get a total of 2mbs
for
transmit and receive.
hope the above helps,
Santosh Koshy
""Network Operations"" [EMAIL PROTECTED] wrote in message
9706m3$ouv$[EMAIL PROTECTED]">news:9706m3$ouv$[EMAIL PROTECTED]...
The 2Mbps link i had mentioned is a serial link (E1) not an ethernet
link.
regards
akshay
--
Network Operations (Mumbai)
Bharti BT Internet Ltd.
Tel:- 91-22-6127242
91-22-6127179
Email :- [EMAIL PROTECTED]
"dark_baby" [EMAIL PROTECTED] wrote in message
96vudv$dqr$[EMAIL PROTECTED]">news:96vudv$dqr$[EMAIL PROTECTED]...
Yes. You'll get 2M Transmit 2M REceive(4M) between AB with full
duplex.
With half duplex transfer rate is poor, it is about 1M or less.
You can imply full duplex only with switch, or just host to host
link.
With
hub, you can only use half duplex , because each station must detect
collision before transfer, full duplex doesn't detect
collision(There
is
no
collision with full duplex).
_
FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to
[EMAIL PROTECTED]
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Re: Full Duplex
Hi,
It depends where you measure it. If you measure a send to a receive the you only get
100Mb but if you measure both circuits the you can see 200Mb. 100Mb (A B) +
100Mb (B A) they are different circuits physically they come together at the
interface (NIC or whatever) then into the box.
My two bobs worth,
Teunis,
Hobart, Tasmania
Australia
On Thursday, February 22, 2001 at 01:05:32 AM, Santosh Koshy wrote:
Yes it is "THEORETICALLY" possible
but network communications hardly ever work that way...
Santosh Koshy
""AndyD"" [EMAIL PROTECTED] wrote in message
9726tq$fj7$[EMAIL PROTECTED]">news:9726tq$fj7$[EMAIL PROTECTED]...
So on a full-duplex 100 mb ethernet link you could theoretically get 200
mbps throughput?? I have had this argument with several people before. I
thought that 100 mb each direction being possible, if both parties
transmit
at the same time but in different directions, you still have 200 mb of
throughput. They all thought I was crazy - said you can't possibly get
more
than 100 mbps out of a 100 mb link.
""Santosh Koshy"" [EMAIL PROTECTED] wrote in message
970klv$f2n$[EMAIL PROTECTED]">news:970klv$f2n$[EMAIL PROTECTED]...
Hi akshay,
If its full duplex you will get 2Mbs of transmit bandwith 2Mbs
of
receive traffic... In a half duplex link you will get a total of 2mbs
for
transmit and receive.
hope the above helps,
Santosh Koshy
""Network Operations"" [EMAIL PROTECTED] wrote in message
9706m3$ouv$[EMAIL PROTECTED]">news:9706m3$ouv$[EMAIL PROTECTED]...
The 2Mbps link i had mentioned is a serial link (E1) not an ethernet
link.
regards
akshay
--
Network Operations (Mumbai)
Bharti BT Internet Ltd.
Tel:- 91-22-6127242
91-22-6127179
Email :- [EMAIL PROTECTED]
"dark_baby" [EMAIL PROTECTED] wrote in message
96vudv$dqr$[EMAIL PROTECTED]">news:96vudv$dqr$[EMAIL PROTECTED]...
Yes. You'll get 2M Transmit 2M REceive(4M) between AB with full
duplex.
With half duplex transfer rate is poor, it is about 1M or less.
You can imply full duplex only with switch, or just host to host
link.
With
hub, you can only use half duplex , because each station must detect
collision before transfer, full duplex doesn't detect
collision(There
is
no
collision with full duplex).
_
FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to
[EMAIL PROTECTED]
_
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--
www.tasmail.com
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Re: Full Duplex
Yes, you can certainly get more than 100mb total throughput, if you add the two directions together. But you can still only get 100 mb in either direction, even if there's no traffic in one direction. It's really a matter of semantics. Marketing types like to add both directions together and claim that as the bandwidth, because they can claim a higher bandwidth that way. But in my opinion it's more useful to say it's 100 mb full duplex, and that tends to still be the standard, particularly for serial links. JMcL -- Forwarded by Jenny Mcleod/NSO/CSDA on 23/02/2001 08:46 am --- "AndyD" [EMAIL PROTECTED]@groupstudy.com on 22/02/2001 03:01:21 pm Please respond to "AndyD" [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] To: [EMAIL PROTECTED] cc: Subject: Re: Full Duplex So on a full-duplex 100 mb ethernet link you could theoretically get 200 mbps throughput?? I have had this argument with several people before. I thought that 100 mb each direction being possible, if both parties transmit at the same time but in different directions, you still have 200 mb of throughput. They all thought I was crazy - said you can't possibly get more than 100 mbps out of a 100 mb link. ""Santosh Koshy"" [EMAIL PROTECTED] wrote in message 970klv$f2n$[EMAIL PROTECTED]">news:970klv$f2n$[EMAIL PROTECTED]... Hi akshay, If its full duplex you will get 2Mbs of transmit bandwith 2Mbs of receive traffic... In a half duplex link you will get a total of 2mbs for transmit and receive. hope the above helps, Santosh Koshy ""Network Operations"" [EMAIL PROTECTED] wrote in message 9706m3$ouv$[EMAIL PROTECTED]">news:9706m3$ouv$[EMAIL PROTECTED]... The 2Mbps link i had mentioned is a serial link (E1) not an ethernet link. regards akshay -- Network Operations (Mumbai) Bharti BT Internet Ltd. Tel:- 91-22-6127242 91-22-6127179 Email :- [EMAIL PROTECTED] "dark_baby" [EMAIL PROTECTED] wrote in message 96vudv$dqr$[EMAIL PROTECTED]">news:96vudv$dqr$[EMAIL PROTECTED]... Yes. You'll get 2M Transmit 2M REceive(4M) between AB with full duplex. With half duplex transfer rate is poor, it is about 1M or less. You can imply full duplex only with switch, or just host to host link. With hub, you can only use half duplex , because each station must detect collision before transfer, full duplex doesn't detect collision(There is no collision with full duplex). _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full Duplex
The 2Mbps link i had mentioned is a serial link (E1) not an ethernet link. regards akshay -- Network Operations (Mumbai) Bharti BT Internet Ltd. Tel:- 91-22-6127242 91-22-6127179 Email :- [EMAIL PROTECTED] "dark_baby" [EMAIL PROTECTED] wrote in message 96vudv$dqr$[EMAIL PROTECTED]">news:96vudv$dqr$[EMAIL PROTECTED]... Yes. You'll get 2M Transmit 2M REceive(4M) between AB with full duplex. With half duplex transfer rate is poor, it is about 1M or less. You can imply full duplex only with switch, or just host to host link. With hub, you can only use half duplex , because each station must detect collision before transfer, full duplex doesn't detect collision(There is no collision with full duplex). _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full Duplex
Hi akshay, If its full duplex you will get 2Mbs of transmit bandwith 2Mbs of receive traffic... In a half duplex link you will get a total of 2mbs for transmit and receive. hope the above helps, Santosh Koshy ""Network Operations"" [EMAIL PROTECTED] wrote in message 9706m3$ouv$[EMAIL PROTECTED]">news:9706m3$ouv$[EMAIL PROTECTED]... The 2Mbps link i had mentioned is a serial link (E1) not an ethernet link. regards akshay -- Network Operations (Mumbai) Bharti BT Internet Ltd. Tel:- 91-22-6127242 91-22-6127179 Email :- [EMAIL PROTECTED] "dark_baby" [EMAIL PROTECTED] wrote in message 96vudv$dqr$[EMAIL PROTECTED]">news:96vudv$dqr$[EMAIL PROTECTED]... Yes. You'll get 2M Transmit 2M REceive(4M) between AB with full duplex. With half duplex transfer rate is poor, it is about 1M or less. You can imply full duplex only with switch, or just host to host link. With hub, you can only use half duplex , because each station must detect collision before transfer, full duplex doesn't detect collision(There is no collision with full duplex). _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full Duplex
So on a full-duplex 100 mb ethernet link you could theoretically get 200 mbps throughput?? I have had this argument with several people before. I thought that 100 mb each direction being possible, if both parties transmit at the same time but in different directions, you still have 200 mb of throughput. They all thought I was crazy - said you can't possibly get more than 100 mbps out of a 100 mb link. ""Santosh Koshy"" [EMAIL PROTECTED] wrote in message 970klv$f2n$[EMAIL PROTECTED]">news:970klv$f2n$[EMAIL PROTECTED]... Hi akshay, If its full duplex you will get 2Mbs of transmit bandwith 2Mbs of receive traffic... In a half duplex link you will get a total of 2mbs for transmit and receive. hope the above helps, Santosh Koshy ""Network Operations"" [EMAIL PROTECTED] wrote in message 9706m3$ouv$[EMAIL PROTECTED]">news:9706m3$ouv$[EMAIL PROTECTED]... The 2Mbps link i had mentioned is a serial link (E1) not an ethernet link. regards akshay -- Network Operations (Mumbai) Bharti BT Internet Ltd. Tel:- 91-22-6127242 91-22-6127179 Email :- [EMAIL PROTECTED] "dark_baby" [EMAIL PROTECTED] wrote in message 96vudv$dqr$[EMAIL PROTECTED]">news:96vudv$dqr$[EMAIL PROTECTED]... Yes. You'll get 2M Transmit 2M REceive(4M) between AB with full duplex. With half duplex transfer rate is poor, it is about 1M or less. You can imply full duplex only with switch, or just host to host link. With hub, you can only use half duplex , because each station must detect collision before transfer, full duplex doesn't detect collision(There is no collision with full duplex). _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full Duplex
Yes it is "THEORETICALLY" possible
but network communications hardly ever work that way...
Santosh Koshy
""AndyD"" [EMAIL PROTECTED] wrote in message
9726tq$fj7$[EMAIL PROTECTED]">news:9726tq$fj7$[EMAIL PROTECTED]...
So on a full-duplex 100 mb ethernet link you could theoretically get 200
mbps throughput?? I have had this argument with several people before. I
thought that 100 mb each direction being possible, if both parties
transmit
at the same time but in different directions, you still have 200 mb of
throughput. They all thought I was crazy - said you can't possibly get
more
than 100 mbps out of a 100 mb link.
""Santosh Koshy"" [EMAIL PROTECTED] wrote in message
970klv$f2n$[EMAIL PROTECTED]">news:970klv$f2n$[EMAIL PROTECTED]...
Hi akshay,
If its full duplex you will get 2Mbs of transmit bandwith 2Mbs
of
receive traffic... In a half duplex link you will get a total of 2mbs
for
transmit and receive.
hope the above helps,
Santosh Koshy
""Network Operations"" [EMAIL PROTECTED] wrote in message
9706m3$ouv$[EMAIL PROTECTED]">news:9706m3$ouv$[EMAIL PROTECTED]...
The 2Mbps link i had mentioned is a serial link (E1) not an ethernet
link.
regards
akshay
--
Network Operations (Mumbai)
Bharti BT Internet Ltd.
Tel:- 91-22-6127242
91-22-6127179
Email :- [EMAIL PROTECTED]
"dark_baby" [EMAIL PROTECTED] wrote in message
96vudv$dqr$[EMAIL PROTECTED]">news:96vudv$dqr$[EMAIL PROTECTED]...
Yes. You'll get 2M Transmit 2M REceive(4M) between AB with full
duplex.
With half duplex transfer rate is poor, it is about 1M or less.
You can imply full duplex only with switch, or just host to host
link.
With
hub, you can only use half duplex , because each station must detect
collision before transfer, full duplex doesn't detect
collision(There
is
no
collision with full duplex).
_
FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to
[EMAIL PROTECTED]
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Full Duplex
Hello friends, What does a FULL Duplex link exactly imply? Suppose i hav a 2Mbps Full duplex link running between say my place a customer's place. Practically does it mean i shud get 2Mbps Transmit 2Mbps Receive traffic simultaneously? if so, at peak traffic (both trans recv) what will be the effect on speed of data transfer, in case if point A is an ISP point B is its customer(for internet usage). Thanks in advance. Regards Akshay CCNA 2.0 -- Network Operations (Mumbai) Bharti BT Internet Ltd. Tel:- 91-22-6127242 91-22-6127179 Email :- [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full Duplex
Hi, Basically full duplex you have a circuit from one device to another that has a send path to the remote receive and visa versa. Each path can send data independantly ie both can send and receive at the same time. In a Half duplex the signal is sent on the same path from both ends when one end is sending the other end must listen and cannot send. Both send and receive use the same path. Full duplex is usually 4 wires half can be 2 wires. Hope this helps Teunis Hobart, Tasmania Australia On Wednesday, February 21, 2001 at 11:05:59 AM, Network Operations wrote: Hello friends, What does a FULL Duplex link exactly imply? Suppose i hav a 2Mbps Full duplex link running between say my place a customer's place. Practically does it mean i shud get 2Mbps Transmit 2Mbps Receive traffic simultaneously? if so, at peak traffic (both trans recv) what will be the effect on speed of data transfer, in case if point A is an ISP point B is its customer(for internet usage). Thanks in advance. Regards Akshay CCNA 2.0 -- Network Operations (Mumbai) Bharti BT Internet Ltd. Tel:- 91-22-6127242 91-22-6127179 Email :- [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] -- www.tasmail.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full Duplex
Yes. You'll get 2M Transmit 2M REceive(4M) between AB with full duplex. With half duplex transfer rate is poor, it is about 1M or less. You can imply full duplex only with switch, or just host to host link. With hub, you can only use half duplex , because each station must detect collision before transfer, full duplex doesn't detect collision(There is no collision with full duplex). _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
full duplex and port speed not configuring
Hi Group, We recently moved one our Management Station - UniX box ( its a Netview box) from 4th to 5th floor. I have connected it to a CAT55 switch. When it was coonected to a Cat55 switch previously , it was operating in full duplex 100mbps. But when i moved it yesterday to another switch port also a CAT 55, the port just doesnt reconfigure to full duplex , 100 Mbps. I manually tried to configure at the switch port. When i try to do it, the port gets disconnected. I have maintained the same vlan, just that its now connected to a different cat55 in another floor. Any thoughts why this happens? I cant get the port up and down, because this is a management station and , once it is up it will send 1000's of pages. So i have to make sure what i do is right. Strange thing is htat, I moved to more unix boxes, and they dont seem to have this proble,\m. I am sure that the unix bozx is configured for full duplex, since it was previosuly operating in full duplex mode. Thanks in advance for any inputs Regards Gayathri _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: full duplex and port speed not configuring
Hi, Check the card in your switch and ensure it supports the speed you are trying. Some Unix boxes do not like to be hard configured others require it. Ensure both the old port and the new port look exactly the same. Also secure ports will give this result. Just some thoughts. Teunis, Hobart, Tasmania Australia On Tuesday, February 20, 2001 at 10:26:36 AM, Gayathri wrote: Hi Group, We recently moved one our Management Station - UniX box ( its a Netview box) from 4th to 5th floor. I have connected it to a CAT55 switch. When it was coonected to a Cat55 switch previously , it was operating in full duplex 100mbps. But when i moved it yesterday to another switch port also a CAT 55, the port just doesnt reconfigure to full duplex , 100 Mbps. I manually tried to configure at the switch port. When i try to do it, the port gets disconnected. I have maintained the same vlan, just that its now connected to a different cat55 in another floor. Any thoughts why this happens? I cant get the port up and down, because this is a management station and , once it is up it will send 1000's of pages. So i have to make sure what i do is right. Strange thing is htat, I moved to more unix boxes, and they dont seem to have this proble,\m. I am sure that the unix bozx is configured for full duplex, since it was previosuly operating in full duplex mode. Thanks in advance for any inputs Regards Gayathri _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] -- www.tasmail.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
2924xl 100mbps full duplex to 5500
I need input or comment. I have two 2924xl switches and 5500 switches on my network. I have a cross over cable connecting the two switches together which will give me 40 ports to work with. The problem that Im running into is that I FEC Port 21 to 24 to 4 port on the 5500 using the same port group trying to communicate at 100mbp not 10mbs. I can communicate at 10mbps Half duplex but unable to communicate at 100mbp full duplex any comment anyone. Send reply to [EMAIL PROTECTED]thank in advance Join 18 million Eudora users by signing up for a free Eudora Web-Mail account at http://www.eudoramail.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: 2924xl 100mbps full duplex to 5500
Please post your config on the 2924 and the 5500. Autonegotiation on all these ports or did you set it to 100 on all 8 ports? "Richard Dukes" [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... I need input or comment. I have two 2924xl switches and 5500 switches on my network. I have a cross over cable connecting the two switches together which will give me 40 ports to work with. The problem that Im running into is that I FEC Port 21 to 24 to 4 port on the 5500 using the same port group trying to communicate at 100mbp not 10mbs. I can communicate at 10mbps Half duplex but unable to communicate at 100mbp full duplex any comment anyone. Send reply to [EMAIL PROTECTED]thank in advance Join 18 million Eudora users by signing up for a free Eudora Web-Mail account at http://www.eudoramail.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Is TDM full duplex or half duplex
Hi everyone, Does anyone know if Time Division Multiplexing will work with only half duplexing or only full duplexing or both. Jeff Lodwick MCSE/CCNA _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Is TDM full duplex or half duplex
TDM to me means T-1 and similar technology. It is full duplex sending seperate transmit and receive bit streams. -Original Message- From: Jeff Lodwick [mailto:[EMAIL PROTECTED]] Sent: Wednesday, October 18, 2000 8:48 AM To: [EMAIL PROTECTED] Subject: Is TDM full duplex or half duplex Hi everyone, Does anyone know if Time Division Multiplexing will work with only half duplexing or only full duplexing or both. Jeff Lodwick MCSE/CCNA __ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Is TDM full duplex or half duplex
Half/full duplexing goes back much further. Half duplex implies a shared media. Often only one can speak at a time. A good analogy would be radio communication where when one is done speaking they use a key word such as "over" to indicate that the other may speak. With full duplex both can simultaneously transmit. In telephony this often referred to a four wire circuit where the two wire circuit went to a hybrid coil circuit that converted it to four wire. Two for transmit, two for receive. Analog can amplify in one direction only - thus the need for four wire circuits for interoffice trunking. The next step is to modulate voice traffic with different carrier frequencies and multiplex the sum over the same four wires. The good news is that many calls can share the same wires. The bad news is that the amplifiers can't tell the difference between signal and noise. So long circuits have increased noise. The solution to noise was to digitize the signal and periodically regenerate it. Anything below a certain threshold is considered noise and is rejected. This was the beginning of TDM, Time Division Multiplexing, aka T-1s. -Original Message- From: Joseph Ezerski [mailto:[EMAIL PROTECTED]] Sent: Wednesday, October 18, 2000 12:21 PM To: 'Daniel Cotts' Subject: RE: Is TDM full duplex or half duplex Correct me if I am wrong, but isn't duplexing an Ethernet-only concept? Joe -Original Message- From: Daniel Cotts [mailto:[EMAIL PROTECTED]] Sent: Wednesday, October 18, 2000 9:02 AM To: 'Jeff Lodwick'; [EMAIL PROTECTED] Subject: RE: Is TDM full duplex or half duplex TDM to me means T-1 and similar technology. It is full duplex sending seperate transmit and receive bit streams. -Original Message- From: Jeff Lodwick [mailto:[EMAIL PROTECTED]] Sent: Wednesday, October 18, 2000 8:48 AM To: [EMAIL PROTECTED] Subject: Is TDM full duplex or half duplex Hi everyone, Does anyone know if Time Division Multiplexing will work with only half duplexing or only full duplexing or both. Jeff Lodwick MCSE/CCNA __ _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
OT: Full-Duplex vs. Half-Duplex
I was just reading Windows 2000 magazine today (hey no flames here) and an interesting thing came up. A reader asked one of the editors why his network performance was so bad on this one machine. Not going into allot of detail here is a quote from the editor's answer: "A second possibility is that the network adapter is defaulting to full-duplex mode instead of half-duplex mode. Often, enabling full-duplex mode on adapters-even when the network configuration (i.e., switches or NICs) supports it-actually reduces performance." Now maybe I don't know something here, but does this sound like a good answer to you? Full-duplex should provide more bandwidth if configured properly. Wouldn't it be more proactive to try and fix whatever the problem is (if it is the problem) with full-duplex, than switch to half-duplex? What do you think??? begin:vcard n:Linehan;Michael tel;fax:612-888-1355 tel;work:612-888-1501 x-mozilla-html:FALSE url:http://www.cadcamsys.com org:CAD/CAM Engineering Systems;Technical Support adr:;;10850 Nesbitt Ave S;Bloomington;MN;55437;USA version:2.1 email;internet:[EMAIL PROTECTED] title:Systems Engineer note:Opinions expressed are not necessarily those of CAD/CAM Engineering Systems fn:Michael Linehan end:vcard
Full-duplex operations
Hi all, By studying the Book : CISCO LAN SWITCHING by Kennedy Clark I found this NOTE on Chapter 1 page 15 :" Windows NT4.0 does not support FULL-DUPLEX operations because of drivers limitations.Some SUN workstations can also experience this, expecialy with Gigabit Ethernet." Has anyone study this? Can I have more details regarding Win NT limitations with full-duplex operations? Priscilla , Bruce what do you know about this problem? Thanks, in advance to everyone. Mike Peterson _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Full-duplex operations
I remember coming across a knowledge base article on Microsoft's site that indicated poor performance with NICs set to full duplex was because Windows NT didn't support full-duplex operation. This was one of those cases where when the Microsoft Help Desk tech had the client change the client's full-duplex settings to half-duplex, and the PC's performance increased drastically, an incorrect assumption was made. I found this article when my husband indicated he was experiencing poor performance at work with a new network card in their server. I gave him the knowledge base article - and it fixed his problem. For many months, I didn't realize the knowledge base article was in error. Windows NT DID support full-duplex, and the driver he was using WAS full-duplex capable. My husband was just plugged into a hub, rather than a switch - and as you know, full-duplex on a hub will NEVER work. Voila. A little more knowledge, and the true cause of the problem was found. If the aut! hors of the book (OR... perhaps it was something the EDITOR added) saw this knowledge base article, they accepted it as fact and didn't fully understand that Microsoft misunderstood the problem. DON'T for a second blame Microsoft for having incorrect information in their knowledge base. There's just as many Cisco "gurus" who don't understand enough about Microsoft's products to be able to draw correct inferences about why something isn't working properly. The best understandings of how things work is when you have enough information to see the whole picture - not just one side (Cisco / Microsoft). Anyhow, I digress. Here's another possibility as to where this myth started: Q217305 - Full Duplex Support with Windows NT http://support.microsoft.com/support/kb/articles/Q217/3/05.ASP?LN=EN-USSD=gnFR=0 -- Leigh Anne -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Mike Peterson Sent: Monday, September 25, 2000 7:18 AM To: [EMAIL PROTECTED] Subject: Full-duplex operations Hi all, By studying the Book : CISCO LAN SWITCHING by Kennedy Clark I found this NOTE on Chapter 1 page 15 :" Windows NT4.0 does not support FULL-DUPLEX operations because of drivers limitations.Some SUN workstations can also experience this, expecialy with Gigabit Ethernet." Has anyone study this? Can I have more details regarding Win NT limitations with full-duplex operations? Priscilla , Bruce what do you know about this problem? Thanks, in advance to everyone. Mike Peterson _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Full-duplex operations
I believe we have had this discussion in a slightly different form in the past. There have been numerous problems with NIC's of all sort, full duplex, half duplex, auto-negotiate, etc and their ability to connect to Cisco switches. I believe that most of these problems have been corrected with either newer NIC's or NIC driver upgrades. I myself have run Windows NT servers full duplex dating back to NT 3.51, both on Compaq servers and on Dell PC's with NT server installed over the original OS. Having run into mistaken beliefs along these lines in several places, and coming from folks with impeccable credentials, and having acted this way myself at times, I tend to believe that most of us in general learn something from experience, file it away, and never revisit it. That's why you will read in some places that IGRP has a max diameter of 100 hops, why you should never use weighted fair queueing with frame relay, and why 3Com 3C509 NIC's will not function when plugged into a Cisco Cat 5000 switch. All of these things were true at one time, or under certain circumstances. They are no longer true. The statement in the book is not correct in and of itself. But one needs be aware that with older NIC's, and older NIC drivers, that there have been problems with Cisco switches. And yes I point to Cisco in particular, because in my case, the 3Com 3C509's worked just fine in an HP switch ( the one OEM'd by Kalperna - HP2916? - which eventually was bought by Cisco ) but did not work at all in a Cisco Cat 5000. On the other hand, 3Com 3C905's worked just fine in the Cat. So I labored for a couple of years under the assumption that the 3C509 did not work. I am told that it does now, using recent drivers. Chuck -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Marc Quibell Sent: Monday, September 25, 2000 9:36 AM To: [EMAIL PROTECTED] Subject:Re: Full-duplex operations IMO, It's a strange statement to say "Windows NT doesn't support full duplex" especially since the duplexing is done between the NIC and the switch port. Am I missing something here? Marc ""Mike Peterson"" [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Hi all, By studying the Book : CISCO LAN SWITCHING by Kennedy Clark I found this NOTE on Chapter 1 page 15 :" Windows NT4.0 does not support FULL-DUPLEX operations because of drivers limitations.Some SUN workstations can also experience this, expecialy with Gigabit Ethernet." Has anyone study this? Can I have more details regarding Win NT limitations with full-duplex operations? Priscilla , Bruce what do you know about this problem? Thanks, in advance to everyone. Mike Peterson _ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] **NOTE: New CCNA/CCDA List has been formed. For more information go to http://www.groupstudy.com/list/Associates.html _ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: 802.3 frame and full-duplex
In fact SD stands for start of frame delimiter. It is an essential component of the synchronization process alongwith the preamble. Regards Atif To: Stephen Ede [EMAIL PROTECTED]; [EMAIL PROTECTED] [EMAIL PROTECTED] Date: Sunday, July 30, 2000 9:30 AM Subject: Re: 802.3 frame and full-duplex Stephen, First, SD is the last octet of the preamble. You get 7 octets of 0x55 and the final octet is 0xD5 which is signaling the start of the Data Link frame, hence SD. On the switch question, if port A,B, and C are sending packets to port D I think that the output queue on D would accumulate the packets if the offered load is greater than the link's capacity. However, the queue is not infinite and eventually you will have to start dropping packets. Jeff Humphreys - Original Message - From: Stephen Ede [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Saturday, July 29, 2000 7:28 PM Subject: 802.3 frame and full-duplex I have 2 questions to submit here... 1) If there are several nodes attached to a 10/100 switch, and all NICs are in full duplex mode, this means that CSMA/CD is not in effect, loopback is turned off, and any station can transmit and receive concurrently. But what happens when 2 or 3 of these stations want to transmit to one particular station concurrently? Is the traffic buffered in the switch? Or is CSMA/CD still in effect, even in full duplex mode, where they will sense the wire and wait if busy? 2) In the diagram below of an 802.3 frame, what does the "SD" potion signify? | Preamble | SD | Dest. Add. | Source Add. | Length | DSAP | SSAP | Control | Data | FCS | Thank you in advance. ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
802.3 frame and full-duplex
I have 2 questions to submit here... 1) If there are several nodes attached to a 10/100 switch, and all NICs are in full duplex mode, this means that CSMA/CD is not in effect, loopback is turned off, and any station can transmit and receive concurrently. But what happens when 2 or 3 of these stations want to transmit to one particular station concurrently? Is the traffic buffered in the switch? Or is CSMA/CD still in effect, even in full duplex mode, where they will sense the wire and wait if busy? 2) In the diagram below of an 802.3 frame, what does the "SD" potion signify? | Preamble | SD | Dest. Add. | Source Add. | Length | DSAP | SSAP | Control | Data | FCS | Thank you in advance. ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: 802.3 frame and full-duplex
Stephen, First, SD is the last octet of the preamble. You get 7 octets of 0x55 and the final octet is 0xD5 which is signaling the start of the Data Link frame, hence SD. On the switch question, if port A,B, and C are sending packets to port D I think that the output queue on D would accumulate the packets if the offered load is greater than the link's capacity. However, the queue is not infinite and eventually you will have to start dropping packets. Jeff Humphreys - Original Message - From: Stephen Ede [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Saturday, July 29, 2000 7:28 PM Subject: 802.3 frame and full-duplex I have 2 questions to submit here... 1) If there are several nodes attached to a 10/100 switch, and all NICs are in full duplex mode, this means that CSMA/CD is not in effect, loopback is turned off, and any station can transmit and receive concurrently. But what happens when 2 or 3 of these stations want to transmit to one particular station concurrently? Is the traffic buffered in the switch? Or is CSMA/CD still in effect, even in full duplex mode, where they will sense the wire and wait if busy? 2) In the diagram below of an 802.3 frame, what does the "SD" potion signify? | Preamble | SD | Dest. Add. | Source Add. | Length | DSAP | SSAP | Control | Data | FCS | Thank you in advance. ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: how to configure VLAN on 2900 switch-how about full duplex and spanning tree
Hi Chee Tong, With your current "show run" below, you're only running one vlan1 on your catalyst 2924. By default, the catalyst 2924 comes with one VLAN1. By adding another VLAN2 in your switch, you can reduce broadcasts on your network. Here is an example of placing port fastethernet0/6 on VLAN2: conf t int fastethernet0/2 switchport access vlan 2 And if you want to enable spanning-tree, first do this to see if it's already enabled on the switch: sh span If it shows that it's "disabled", then you can do this to enable it: conf t spanning Hope it'll help you. Luan T. Kim, MCSE, CCNA* Systems/Network Infrastructure Engineer* MP3.COM, INC. http://www.mp3.com * Phone: 858-623-7341Cell: 858-382-3055 * Fax: 858-623-7400Email: [EMAIL PROTECTED] * On Mon, 3 Jul 2000, Sim, CT (Chee Tong) wrote: Hi.. Kim! Thank for your info, but I am going to ask you futher , what is the difference between VLAN1 and VLAN2, pls take a look on the following configuration file, the VLAN1 (below) it is for every fastethernet interface? what is the syntax to configure spanning tree and full duplex on the interface. Thank you in advance :) Tong User Access Verification Password: Password: simtesten Password: simtest#sh conf Using 1315 out of 32768 bytes ! version 12.0 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname simtest ! enable secret 5 $1$C8R4$zMASNLTu0DeKZ.gCgcomt. ! ! ! ! ! ! ip subnet-zero ! ! ! interface FastEthernet0/1 ! interface FastEthernet0/2 ! interface FastEthernet0/3 ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface FastEthernet0/16 ! interface FastEthernet0/17 ! interface FastEthernet0/18 ! interface FastEthernet0/19 ! interface FastEthernet0/20 ! interface FastEthernet0/21 ! interface FastEthernet0/22 ! interface FastEthernet0/23 ! interface FastEthernet0/24 ! interface VLAN1 ip address 57.198.165.200 255.255.254.0 no ip directed-broadcast no ip route-cache ! ip default-gateway 57.198.164.1 snmp-server engineID local 0009020196F23840 snmp-server community private RW snmp-server community public RO snmp-server chassis-id 0x10 ! line con 0 transport input none stopbits 1 line vty 0 4 password login line vty 5 15 password XX login ! end -Original Message- From: Luan Kim [mailto:[EMAIL PROTECTED]] Sent: Monday, July 03, 2000 10:14 AM To: Sim, CT (Chee Tong) Cc: 'John Hardman'; '[EMAIL PROTECTED]' Subject: Re: how to configure VLAN on 2900 switch hi Chee Tong, By default, your cat29xx comes with one vlan(vlan1). For example, if you want to place your fastethernet0/13 on vlan2, you do this: conf t int fastEthernet 0/13 switchport access vlan 2 Hope it'll help you. Luan T. Kim, MCSE, CCNA* Systems/Network Infrastructure Engineer* MP3.COM, INC. http://www.mp3.com * Phone: 858-623-7341Cell: 858-382-3055 * Fax: 858-623-7400Email: [EMAIL PROTECTED] * On Mon, 3 Jul 2000, Sim, CT (Chee Tong) wrote: Dear Friends, What is the procedure to configure VLan on 2900 switches, wat command to use? If we don't configured VLAN on 2900 switches, will it cause the slowness in the network Chee Tong == De informatie opgenomen in dit bericht kan vertrouwelijk zijn en is uitsluitend bestemd voor de geadresseerde. Indien u dit bericht onterecht ontvangt wordt u verzocht de inhoud niet te gebruiken en de afzender direct te informeren door het bericht te retourneren. == The information contained in this message may be confidential and is intended to be exclusively for the addressee. Should you receive this message unintentionally, please do not use the contents herein and notify the sender immediately by return e-mail. == ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure
Re: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree
Hi First you have to define VLAN 2. In the enable mode, (not the config mode!), type the following Vlan database Vlan vlan2 Vtp server Vtp domain domain_name Apply Exit Then continue as specified below Regards Geoffrey - Original Message - From: "Luan Kim" [EMAIL PROTECTED] To: "Sim, CT (Chee Tong)" [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Monday, July 03, 2000 12:48 PM Subject: RE: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree Hi Chee Tong, With your current "show run" below, you're only running one vlan1 on your catalyst 2924. By default, the catalyst 2924 comes with one VLAN1. By adding another VLAN2 in your switch, you can reduce broadcasts on your network. Here is an example of placing port fastethernet0/6 on VLAN2: conf t int fastethernet0/2 switchport access vlan 2 And if you want to enable spanning-tree, first do this to see if it's already enabled on the switch: sh span If it shows that it's "disabled", then you can do this to enable it: conf t spanning Hope it'll help you. Luan T. Kim, MCSE, CCNA* Systems/Network Infrastructure Engineer* MP3.COM, INC. http://www.mp3.com * Phone: 858-623-7341Cell: 858-382-3055 * Fax: 858-623-7400Email: [EMAIL PROTECTED] * On Mon, 3 Jul 2000, Sim, CT (Chee Tong) wrote: Hi.. Kim! Thank for your info, but I am going to ask you futher , what is the difference between VLAN1 and VLAN2, pls take a look on the following configuration file, the VLAN1 (below) it is for every fastethernet interface? what is the syntax to configure spanning tree and full duplex on the interface. Thank you in advance :) Tong User Access Verification Password: Password: simtesten Password: simtest#sh conf Using 1315 out of 32768 bytes ! version 12.0 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname simtest ! enable secret 5 $1$C8R4$zMASNLTu0DeKZ.gCgcomt. ! ! ! ! ! ! ip subnet-zero ! ! ! interface FastEthernet0/1 ! interface FastEthernet0/2 ! interface FastEthernet0/3 ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface FastEthernet0/16 ! interface FastEthernet0/17 ! interface FastEthernet0/18 ! interface FastEthernet0/19 ! interface FastEthernet0/20 ! interface FastEthernet0/21 ! interface FastEthernet0/22 ! interface FastEthernet0/23 ! interface FastEthernet0/24 ! interface VLAN1 ip address 57.198.165.200 255.255.254.0 no ip directed-broadcast no ip route-cache ! ip default-gateway 57.198.164.1 snmp-server engineID local 0009020196F23840 snmp-server community private RW snmp-server community public RO snmp-server chassis-id 0x10 ! line con 0 transport input none stopbits 1 line vty 0 4 password login line vty 5 15 password XX login ! end -Original Message- From: Luan Kim [mailto:[EMAIL PROTECTED]] Sent: Monday, July 03, 2000 10:14 AM To: Sim, CT (Chee Tong) Cc: 'John Hardman'; '[EMAIL PROTECTED]' Subject: Re: how to configure VLAN on 2900 switch hi Chee Tong, By default, your cat29xx comes with one vlan(vlan1). For example, if you want to place your fastethernet0/13 on vlan2, you do this: conf t int fastEthernet 0/13 switchport access vlan 2 Hope it'll help you. Luan T. Kim, MCSE, CCNA* Systems/Network Infrastructure Engineer* MP3.COM, INC. http://www.mp3.com * Phone: 858-623-7341Cell: 858-382-3055 * Fax: 858-623-7400Email: [EMAIL PROTECTED] * On Mon, 3 Jul 2000, Sim, CT (Chee Tong) wrote: Dear Friends, What is the procedure to configure VLan on 2900 switches, wat command to use? If we don't configured VLAN on 2900 switches, will it cause the slowness in the network Chee Tong == De informatie opgenomen in dit bericht kan vertrouwelijk zijn en is uitsluitend bestemd voor de geadresseerde. Indien u dit bericht onterecht ontvangt wordt u verzocht de inhoud niet te gebruiken en de afzender direct te informeren door het bericht te retourneren. ===
