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=7&i=57672&t=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=7&i=57519&t=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=7&i=57475&t=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=7&i=57474&t=57431 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nond
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=7&i=57472&t=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=7&i=57471&t=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=7&i=57469&t=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=7&i=57466&t=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=7&i=57457&t=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=7&i=57445&t=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=7&i=57443&t=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=7&i=57433&t=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 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=7&i=47567&t=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=7&i=47568&t=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 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 1&2 and > > 3&6 > > > 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=7&i=31736&t=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]
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 1&2 and > 3&6 > > 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=7&i=31728&t=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 1&2 and 3&6 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=7&i=31682&t=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=7&i=31683&t=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 1&2 >and >3&6 >> 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=7&i=31681&t=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=7&i=31676&t=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 1&2 and 3&6 > 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=7&i=31670&t=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 1&2 and > 3&6 > > 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=7&i=31667&t=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 1&2 and 3&6 > 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=7&i=31665&t=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 1&2 and 3&6 > 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=7&i=31664&t=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 1&2 and 3&6 > 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=7&i=31663&t=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 1&2 and 3&6 > 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=7&i=31661&t=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 1&2 and 3&6 > 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=7&i=31659&t=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 1&2 and 3&6 > 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=7&i=31657&t=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=7&i=31655&t=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 1&2 and 3&6 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=7&i=31654&t=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=7&i=31653&t=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]
There is no difference. There is no such thing as half- or full-duplex ethernet twisted pair cable. Ethernet uses pins 1,2,3 and 6 regardless of duplex settings. >>> "mlh" 1/11/02 9:56:01 AM >>> 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=7&i=31651&t=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 1&2 and 3&6 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=7&i=31649&t=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]
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=7&i=31646&t=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 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: 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 > >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
>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
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
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
==
_
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 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
==
_
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]
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 A&B 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] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
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 A&B 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
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$[EMAIL PROTECTED]... > > > Yes. You'll get 2M Transmit & 2M REceive(4M) between A&B with full > duplex. > > > With half duplex transfer rate is poor, it is about 1M or less. > > > You can imply full duplex only with switch, or just host to host link. > > With > > > hub, you can only use half duplex , because each station must detect > > > collision before transfer, full duplex doesn't detect collision(There is > > no > > > collision with full duplex). > > > > > > > > > > > > _ > > > FAQ, list archives, and subscription info: > > http://www.groupstudy.com/list/cisco.html > > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > > > > > > > > _ > > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > > > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full Duplex
Hi, It depends where you measure it. If you measure a send to a receive the you only get 100Mb but if you measure both circuits the you can see 200Mb. 100Mb (A > B) + 100Mb (B > A) they are different circuits physically they come together at the interface (NIC or whatever) then into the box. My two bobs worth, Teunis, Hobart, Tasmania Australia On Thursday, February 22, 2001 at 01:05:32 AM, Santosh Koshy wrote: > Yes it is "THEORETICALLY" possible > but network communications hardly ever work that way... > > Santosh Koshy > > > ""AndyD"" <[EMAIL PROTECTED]> wrote in message > 9726tq$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 A&B 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] > > -- 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, 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$[EMAIL PROTECTED]... > > > > Yes. You'll get 2M Transmit & 2M REceive(4M) between A&B with full > > duplex. > > > > With half duplex transfer rate is poor, it is about 1M or less. > > > > You can imply full duplex only with switch, or just host to host link. > > > With > > > > hub, you can only use half duplex , because each station must detect > > > > collision before transfer, full duplex doesn't detect collision(There > is > > > no > > > > collision with full duplex). > > > > > > > > > > > > > > > > _ > > > > FAQ, list archives, and subscription info: > > > http://www.groupstudy.com/list/cisco.html > > > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > > > > > > > > > > > > _ > > > FAQ, list archives, and subscription info: > > http://www.groupstudy.com/list/cisco.html > > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > > > > > > > > _ > > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > > > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full Duplex
Yes it is "THEORETICALLY" possible but network communications hardly ever work that way... Santosh Koshy ""AndyD"" <[EMAIL PROTECTED]> wrote in message 9726tq$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$[EMAIL PROTECTED]... > > > > Yes. You'll get 2M Transmit & 2M REceive(4M) between A&B with full > > duplex. > > > > With half duplex transfer rate is poor, it is about 1M or less. > > > > You can imply full duplex only with switch, or just host to host link. > > > With > > > > hub, you can only use half duplex , because each station must detect > > > > collision before transfer, full duplex doesn't detect collision(There > is > > > no > > > > collision with full duplex). > > > > > > > > > > > > > > > > _ > > > > FAQ, list archives, and subscription info: > > > http://www.groupstudy.com/list/cisco.html > > > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > > > > > > > > > > > > _ > > > FAQ, list archives, and subscription info: > > http://www.groupstudy.com/list/cisco.html > > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > > > > > > > > _ > > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > > > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full Duplex
So on a full-duplex 100 mb ethernet link you could theoretically get 200 mbps throughput?? I have had this argument with several people before. I thought that 100 mb each direction being possible, if both parties transmit at the same time but in different directions, you still have 200 mb of throughput. They all thought I was crazy - said you can't possibly get more than 100 mbps out of a 100 mb link. ""Santosh Koshy"" <[EMAIL PROTECTED]> wrote in message 970klv$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$[EMAIL PROTECTED]... > > > Yes. You'll get 2M Transmit & 2M REceive(4M) between A&B with full > duplex. > > > With half duplex transfer rate is poor, it is about 1M or less. > > > You can imply full duplex only with switch, or just host to host link. > > With > > > hub, you can only use half duplex , because each station must detect > > > collision before transfer, full duplex doesn't detect collision(There is > > no > > > collision with full duplex). > > > > > > > > > > > > _ > > > FAQ, list archives, and subscription info: > > http://www.groupstudy.com/list/cisco.html > > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > > > > > > > > _ > > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > > > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full Duplex
Hi akshay, If its full duplex you will get 2Mbs of transmit bandwith & 2Mbs of receive traffic... In a half duplex link you will get a total of 2mbs for transmit and receive. hope the above helps, Santosh Koshy ""Network Operations"" <[EMAIL PROTECTED]> wrote in message 9706m3$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$[EMAIL PROTECTED]... > > Yes. You'll get 2M Transmit & 2M REceive(4M) between A&B with full duplex. > > With half duplex transfer rate is poor, it is about 1M or less. > > You can imply full duplex only with switch, or just host to host link. > With > > hub, you can only use half duplex , because each station must detect > > collision before transfer, full duplex doesn't detect collision(There is > no > > collision with full duplex). > > > > > > > > _ > > FAQ, list archives, and subscription info: > http://www.groupstudy.com/list/cisco.html > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > > > > > _ > FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] > _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Full Duplex
The 2Mbps link i had mentioned is a serial link (E1) & not an ethernet link. regards akshay -- Network Operations (Mumbai) Bharti BT Internet Ltd. Tel:- 91-22-6127242 91-22-6127179 Email :- [EMAIL PROTECTED] "dark_baby" <[EMAIL PROTECTED]> wrote in message 96vudv$dqr$[EMAIL PROTECTED]">news:96vudv$dqr$[EMAIL PROTECTED]... > Yes. You'll get 2M Transmit & 2M REceive(4M) between A&B 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
Yes. You'll get 2M Transmit & 2M REceive(4M) between A&B 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]
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 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]
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: 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]
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-US&SD=gn&FR=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]
