Re: how to configure VLAN on 2900 switch-how about full duplex and spanning tree
Hi Geoffrey, I believe Chee Tong was asking about vlan's in a catalyst 2924 model. The syntax you showed down below is probably for configuring a high end cat55xx or 65xx. You CANNOT use those syntax on a catalyst 2924; they don't exist. Luan T. Kim, MCSE, CCNA* Systems/Network Infrastructure Engineer* MP3.COM, INC. http://www.mp3.com * Phone: 858-623-7341Cell: 858-382-3055 * Fax: 858-623-7400Email: [EMAIL PROTECTED] * On Mon, 3 Jul 2000, A. Geoffrey Cauchi wrote: Hi First you have to define VLAN 2. In the enable mode, (not the config mode!), type the following Vlan database Vlan vlan2 Vtp server Vtp domain domain_name Apply Exit Then continue as specified below Regards Geoffrey - Original Message - From: "Luan Kim" [EMAIL PROTECTED] To: "Sim, CT (Chee Tong)" [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Monday, July 03, 2000 12:48 PM Subject: RE: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree Hi Chee Tong, With your current "show run" below, you're only running one vlan1 on your catalyst 2924. By default, the catalyst 2924 comes with one VLAN1. By adding another VLAN2 in your switch, you can reduce broadcasts on your network. Here is an example of placing port fastethernet0/6 on VLAN2: conf t int fastethernet0/2 switchport access vlan 2 And if you want to enable spanning-tree, first do this to see if it's already enabled on the switch: sh span If it shows that it's "disabled", then you can do this to enable it: conf t spanning Hope it'll help you. Luan T. Kim, MCSE, CCNA* Systems/Network Infrastructure Engineer* MP3.COM, INC. http://www.mp3.com * Phone: 858-623-7341Cell: 858-382-3055 * Fax: 858-623-7400Email: [EMAIL PROTECTED] * On Mon, 3 Jul 2000, Sim, CT (Chee Tong) wrote: Hi.. Kim! Thank for your info, but I am going to ask you futher , what is the difference between VLAN1 and VLAN2, pls take a look on the following configuration file, the VLAN1 (below) it is for every fastethernet interface? what is the syntax to configure spanning tree and full duplex on the interface. Thank you in advance :) Tong User Access Verification Password: Password: simtesten Password: simtest#sh conf Using 1315 out of 32768 bytes ! version 12.0 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname simtest ! enable secret 5 $1$C8R4$zMASNLTu0DeKZ.gCgcomt. ! ! ! ! ! ! ip subnet-zero ! ! ! interface FastEthernet0/1 ! interface FastEthernet0/2 ! interface FastEthernet0/3 ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface FastEthernet0/16 ! interface FastEthernet0/17 ! interface FastEthernet0/18 ! interface FastEthernet0/19 ! interface FastEthernet0/20 ! interface FastEthernet0/21 ! interface FastEthernet0/22 ! interface FastEthernet0/23 ! interface FastEthernet0/24 ! interface VLAN1 ip address 57.198.165.200 255.255.254.0 no ip directed-broadcast no ip route-cache ! ip default-gateway 57.198.164.1 snmp-server engineID local 0009020196F23840 snmp-server community private RW snmp-server community public RO snmp-server chassis-id 0x10 ! line con 0 transport input none stopbits 1 line vty 0 4 password login line vty 5 15 password XX login ! end -Original Message- From: Luan Kim [mailto:[EMAIL PROTECTED]] Sent: Monday, July 03, 2000 10:14 AM To: Sim, CT (Chee Tong) Cc: 'John Hardman'; '[EMAIL PROTECTED]' Subject: Re: how to configure VLAN on 2900 switch hi Chee Tong, By default, your cat29xx comes with one vlan(vlan1). For example, if you want to place your fastethernet0/13 on vlan2, you do this: conf t int fastEthernet 0/13 switchport access vlan 2 Hope it'll help you. Luan T. Kim, MCSE, CCNA* Systems/Network Infrastructure Engineer* MP3.COM, INC. http://www.mp3.com
Re: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree
Hi Luan I do not agree with you. They do exist, infact I use it on mine. It is very strange that the VLAN is not defined in the configuration mode, but that is the way it is. also, to see them you have to go in the vlan database, and type show. If you have a catalyst, you can try it out! Geoffrey. - Original Message - From: "Luan Kim" [EMAIL PROTECTED] To: "A. Geoffrey Cauchi" [EMAIL PROTECTED] Cc: "Sim, CT (Chee Tong)" [EMAIL PROTECTED]; [EMAIL PROTECTED] Sent: Monday, July 03, 2000 1:33 PM Subject: Re: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree Hi Geoffrey, I believe Chee Tong was asking about vlan's in a catalyst 2924 model. The syntax you showed down below is probably for configuring a high end cat55xx or 65xx. You CANNOT use those syntax on a catalyst 2924; they don't exist. Luan T. Kim, MCSE, CCNA* Systems/Network Infrastructure Engineer* MP3.COM, INC. http://www.mp3.com * Phone: 858-623-7341Cell: 858-382-3055 * Fax: 858-623-7400Email: [EMAIL PROTECTED] * On Mon, 3 Jul 2000, A. Geoffrey Cauchi wrote: Hi First you have to define VLAN 2. In the enable mode, (not the config mode!), type the following Vlan database Vlan vlan2 Vtp server Vtp domain domain_name Apply Exit Then continue as specified below Regards Geoffrey - Original Message - From: "Luan Kim" [EMAIL PROTECTED] To: "Sim, CT (Chee Tong)" [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Monday, July 03, 2000 12:48 PM Subject: RE: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree Hi Chee Tong, With your current "show run" below, you're only running one vlan1 on your catalyst 2924. By default, the catalyst 2924 comes with one VLAN1. By adding another VLAN2 in your switch, you can reduce broadcasts on your network. Here is an example of placing port fastethernet0/6 on VLAN2: conf t int fastethernet0/2 switchport access vlan 2 And if you want to enable spanning-tree, first do this to see if it's already enabled on the switch: sh span If it shows that it's "disabled", then you can do this to enable it: conf t spanning Hope it'll help you. Luan T. Kim, MCSE, CCNA* Systems/Network Infrastructure Engineer* MP3.COM, INC. http://www.mp3.com * Phone: 858-623-7341Cell: 858-382-3055 * Fax: 858-623-7400Email: [EMAIL PROTECTED] * On Mon, 3 Jul 2000, Sim, CT (Chee Tong) wrote: Hi.. Kim! Thank for your info, but I am going to ask you futher , what is the difference between VLAN1 and VLAN2, pls take a look on the following configuration file, the VLAN1 (below) it is for every fastethernet interface? what is the syntax to configure spanning tree and full duplex on the interface. Thank you in advance :) Tong User Access Verification Password: Password: simtesten Password: simtest#sh conf Using 1315 out of 32768 bytes ! version 12.0 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname simtest ! enable secret 5 $1$C8R4$zMASNLTu0DeKZ.gCgcomt. ! ! ! ! ! ! ip subnet-zero ! ! ! interface FastEthernet0/1 ! interface FastEthernet0/2 ! interface FastEthernet0/3 ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface FastEthernet0/16 ! interface FastEthernet0/17 ! interface FastEthernet0/18 ! interface FastEthernet0/19 ! interface FastEthernet0/20 ! interface FastEthernet0/21 ! interface FastEthernet0/22 ! interface FastEthernet0/23 ! interface FastEthernet0/24 ! interface VLAN1 ip address 57.198.165.200 255.255.254.0 no ip directed-broadcast no ip route-cache ! ip default-gateway 57.198.164.1 snmp-server engineID local 0009020196F23840 snmp-server community private RW snmp-server community public RO snmp-server chassis-id 0x10 ! line con 0 transport input none stopbits 1 line vty 0 4 pass
Re: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree
But after configuring second VLAN, my different can't talk to each other. what colud be the problem and how i can solve that. My net address are 192.168.1.x, 192.168.2.x, 192.168.3.x, 192.168.4.x and mail Enterprise sw is on 192.168.3.x and one switch for all other net. Gm - Original Message - From: A. Geoffrey Cauchi [EMAIL PROTECTED] To: Luan Kim [EMAIL PROTECTED]; Sim, CT (Chee Tong) [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Monday, July 03, 2000 4:51 PM Subject: Re: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree Hi First you have to define VLAN 2. In the enable mode, (not the config mode!), type the following Vlan database Vlan vlan2 Vtp server Vtp domain domain_name Apply Exit Then continue as specified below Regards Geoffrey - Original Message - From: "Luan Kim" [EMAIL PROTECTED] To: "Sim, CT (Chee Tong)" [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Monday, July 03, 2000 12:48 PM Subject: RE: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree Hi Chee Tong, With your current "show run" below, you're only running one vlan1 on your catalyst 2924. By default, the catalyst 2924 comes with one VLAN1. By adding another VLAN2 in your switch, you can reduce broadcasts on your network. Here is an example of placing port fastethernet0/6 on VLAN2: conf t int fastethernet0/2 switchport access vlan 2 And if you want to enable spanning-tree, first do this to see if it's already enabled on the switch: sh span If it shows that it's "disabled", then you can do this to enable it: conf t spanning Hope it'll help you. Luan T. Kim, MCSE, CCNA* Systems/Network Infrastructure Engineer* MP3.COM, INC. http://www.mp3.com * Phone: 858-623-7341Cell: 858-382-3055 * Fax: 858-623-7400Email: [EMAIL PROTECTED] * On Mon, 3 Jul 2000, Sim, CT (Chee Tong) wrote: Hi.. Kim! Thank for your info, but I am going to ask you futher , what is the difference between VLAN1 and VLAN2, pls take a look on the following configuration file, the VLAN1 (below) it is for every fastethernet interface? what is the syntax to configure spanning tree and full duplex on the interface. Thank you in advance :) Tong User Access Verification Password: Password: simtesten Password: simtest#sh conf Using 1315 out of 32768 bytes ! version 12.0 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname simtest ! enable secret 5 $1$C8R4$zMASNLTu0DeKZ.gCgcomt. ! ! ! ! ! ! ip subnet-zero ! ! ! interface FastEthernet0/1 ! interface FastEthernet0/2 ! interface FastEthernet0/3 ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface FastEthernet0/16 ! interface FastEthernet0/17 ! interface FastEthernet0/18 ! interface FastEthernet0/19 ! interface FastEthernet0/20 ! interface FastEthernet0/21 ! interface FastEthernet0/22 ! interface FastEthernet0/23 ! interface FastEthernet0/24 ! interface VLAN1 ip address 57.198.165.200 255.255.254.0 no ip directed-broadcast no ip route-cache ! ip default-gateway 57.198.164.1 snmp-server engineID local 0009020196F23840 snmp-server community private RW snmp-server community public RO snmp-server chassis-id 0x10 ! line con 0 transport input none stopbits 1 line vty 0 4 password login line vty 5 15 password XX login ! end -Original Message- From: Luan Kim [mailto:[EMAIL PROTECTED]] Sent: Monday, July 03, 2000 10:14 AM To: Sim, CT (Chee Tong) Cc: 'John Hardman'; '[EMAIL PROTECTED]' Subject: Re: how to configure VLAN on 2900 switch hi Chee Tong, By default, your cat29xx comes with one vlan(vlan1). For example, if you want to place your fastethernet0/13 on vlan2, you do this: conf t int fastEthernet 0/13 switchport access vlan 2 Hope it'll help you. Luan T. Kim, MCSE, CCNA* Systems/Network Infrastructure Engineer* MP3.COM, INC. http://www.mp3.com * Phone: 858-623-7341Cell: 858-382-3055 * Fax:
Re: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree
I don't know a whole lot about VLANs, but everything so far has said that you need a router to communicate between VLANs. --- brain at yahoo [EMAIL PROTECTED] wrote: But after configuring second VLAN, my different can't talk to each other. what colud be the problem and how i can solve that. My net address are 192.168.1.x, 192.168.2.x, 192.168.3.x, 192.168.4.x and mail Enterprise sw is on 192.168.3.x and one switch for all other net. Gm - Original Message - From: A. Geoffrey Cauchi [EMAIL PROTECTED] To: Luan Kim [EMAIL PROTECTED]; Sim, CT (Chee Tong) [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Monday, July 03, 2000 4:51 PM Subject: Re: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree Hi First you have to define VLAN 2. In the enable mode, (not the config mode!), type the following Vlan database Vlan vlan2 Vtp server Vtp domain domain_name Apply Exit Then continue as specified below Regards Geoffrey - Original Message - From: "Luan Kim" [EMAIL PROTECTED] To: "Sim, CT (Chee Tong)" [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Monday, July 03, 2000 12:48 PM Subject: RE: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree Hi Chee Tong, With your current "show run" below, you're only running one vlan1 on your catalyst 2924. By default, the catalyst 2924 comes with one VLAN1. By adding another VLAN2 in your switch, you can reduce broadcasts on your network. Here is an example of placing port fastethernet0/6 on VLAN2: conf t int fastethernet0/2 switchport access vlan 2 And if you want to enable spanning-tree, first do this to see if it's already enabled on the switch: sh span If it shows that it's "disabled", then you can do this to enable it: conf t spanning Hope it'll help you. Luan T. Kim, MCSE, CCNA* Systems/Network Infrastructure Engineer* MP3.COM, INC. http://www.mp3.com * Phone: 858-623-7341Cell: 858-382-3055 * Fax: 858-623-7400Email: [EMAIL PROTECTED] * On Mon, 3 Jul 2000, Sim, CT (Chee Tong) wrote: Hi.. Kim! Thank for your info, but I am going to ask you futher , what is the difference between VLAN1 and VLAN2, pls take a look on the following configuration file, the VLAN1 (below) it is for every fastethernet interface? what is the syntax to configure spanning tree and full duplex on the interface. Thank you in advance :) Tong User Access Verification Password: Password: simtesten Password: simtest#sh conf Using 1315 out of 32768 bytes ! version 12.0 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname simtest ! enable secret 5 $1$C8R4$zMASNLTu0DeKZ.gCgcomt. ! ! ! ! ! ! ip subnet-zero ! ! ! interface FastEthernet0/1 ! interface FastEthernet0/2 ! interface FastEthernet0/3 ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface FastEthernet0/16 ! interface FastEthernet0/17 ! interface FastEthernet0/18 ! interface FastEthernet0/19 ! interface FastEthernet0/20 ! interface FastEthernet0/21 ! interface FastEthernet0/22 ! interface FastEthernet0/23 ! interface FastEthernet0/24 ! interface VLAN1 ip address 57.198.165.200 255.255.254.0 no ip directed-broadcast no ip route-cache ! ip default-gateway 57.198.164.1 snmp-server engineID local 0009020196F23840 snmp-server community private RW snmp-server community public RO === message truncated === = Dan West -- CCNA __ Do You Yahoo!? Kick off your party with Yahoo! Invites. http://invites.yahoo.com/ ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree
At 07:38 PM 7/3/00 +0530, you wrote: then what is the advantage of vlan? if we need a router between vlans. Gm vlans's are good for segmenting broadcast traffic (creating more broadcast domains), security (not forwarding sensitive traffic to unauthorized hosts), and for ease of administration. Roman ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree
A VLAN is logically the same as a physical routed LAN. Users on the same VLAN generally belong to the same IP subnet. VLANs are created for the following reasons: 1. Containing the propogation of broadcasts in a switched environment. 2. Security 3. VLANs can be more flexible than traditional routed LANs. For example, if a user needs to move from one VLAN to another (e.g employee changing departments) their PC can move to that VLAN by configuring the switch port to be in the appropriate VLAN. There is no need for re-patching. Cormac Long CCSI#21600 http://www.cormaclong.com --- brain at yahoo [EMAIL PROTECTED] wrote: then what is the advantage of vlan? if we need a router between vlans. Gm - Original Message - From: Dan West [EMAIL PROTECTED] To: brain at yahoo [EMAIL PROTECTED]; A. Geoffrey Cauchi [EMAIL PROTECTED]; Luan Kim [EMAIL PROTECTED]; Sim, CT (Chee Tong) [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Monday, July 03, 2000 5:57 PM Subject: Re: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree I don't know a whole lot about VLANs, but everything so far has said that you need a router to communicate between VLANs. --- brain at yahoo [EMAIL PROTECTED] wrote: But after configuring second VLAN, my different can't talk to each other. what colud be the problem and how i can solve that. My net address are 192.168.1.x, 192.168.2.x, 192.168.3.x, 192.168.4.x and mail Enterprise sw is on 192.168.3.x and one switch for all other net. Gm - Original Message - From: A. Geoffrey Cauchi [EMAIL PROTECTED] To: Luan Kim [EMAIL PROTECTED]; Sim, CT (Chee Tong) [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Monday, July 03, 2000 4:51 PM Subject: Re: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree Hi First you have to define VLAN 2. In the enable mode, (not the config mode!), type the following Vlan database Vlan vlan2 Vtp server Vtp domain domain_name Apply Exit Then continue as specified below Regards Geoffrey - Original Message - From: "Luan Kim" [EMAIL PROTECTED] To: "Sim, CT (Chee Tong)" [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Monday, July 03, 2000 12:48 PM Subject: RE: how to configure VLAN on 2900 switch-how about full duplex an d spanning tree Hi Chee Tong, With your current "show run" below, you're only running one vlan1 on your catalyst 2924. By default, the catalyst 2924 comes with one VLAN1. By adding another VLAN2 in your switch, you can reduce broadcasts on your network. Here is an example of placing port fastethernet0/6 on VLAN2: conf t int fastethernet0/2 switchport access vlan 2 And if you want to enable spanning-tree, first do this to see if it's already enabled on the switch: sh span If it shows that it's "disabled", then you can do this to enable it: conf t spanning Hope it'll help you. Luan T. Kim, MCSE, CCNA* Systems/Network Infrastructure Engineer* MP3.COM, INC. http://www.mp3.com * Phone: 858-623-7341Cell: 858-382-3055 * Fax: 858-623-7400Email: [EMAIL PROTECTED] * On Mon, 3 Jul 2000, Sim, CT (Chee Tong) wrote: Hi.. Kim! Thank for your info, but I am going to ask you futher , what is the difference between VLAN1 and VLAN2, pls take a look on the following configuration file, the VLAN1 (below) it is for every fastethernet interface? what is the syntax to configure spanning tree and full duplex on the interface. Thank you in advance :) Tong User Access Verification Password: Password: simtesten Password: simtest#sh conf Using 1315 out of 32768 bytes ! version 12.0 no service pad service timestamps debug uptime service timestamps log uptime no service password-encryption ! hostname simtest ! enable secret 5 $1$C8R4$zMASNLTu0DeKZ.gCgcomt. ! ! ! ! ! ! ip subnet-zero ! ! ! interface FastEthernet0/1 ! interface FastEthernet0/2 ! interface FastEthernet0/3 ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! === message truncat
Cat 1900 and Full Duplex
Cisco's website documentation says that full duplex operation is available on all ethernet and fastethernet ports. However, I have several 1900s and I cannot see how to turn on full duplex operation on ethernet ports. The fastethernet ports have an option under Port Configuration, but no such setting exists for the 10baseT ports. There is also no mention when you view the port whether it is running half or full, or if it autonegotiating. Do only the new 1900 switches support full duplex on all ports? ___ Get 100% FREE Internet Access powered by Excite Visit http://freelane.excite.com/freeisp ___ 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: CSMA/CD : full duplex
To be pedantic, a collision is an event which occurs over the wires/fibre. If congestion happens internally in a switch/router it may be a problem but it is not in network speak a collision. -- From: woody[SMTP:[EMAIL PROTECTED]] Reply To: woody Sent: 11 May 2000 10:22 To: [EMAIL PROTECTED] Subject: Re: CSMA/CD : full duplex Further to my original post... It is possible to get collisions on a Full Duplex segment. Transmission from the switch towards the destination is a shared bandwidth domain (with other originating hosts transmitting towards the same destination). As such collisions may occur on the transmit from the switch towards the destination. CSMA/CD is used to overcome this. This may be done internally within the switch (buffering of frames etc) but it is still there... Keith ""Joe Martin"" [EMAIL PROTECTED] wrote in message 8fbq4s$80t$[EMAIL PROTECTED]">news:8fbq4s$80t$[EMAIL PROTECTED]... Full duplex transmission requires a point to point connection between two devices. This is achieved using a switch. Since the connection is between two and only two devices at a time, this allows them to transmit and receive at the same time. Thus a collision would never occur and CSMA/CD is unnecessary. JOE CCNP, CCDP, and a few other things... "Dan West" [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Sorry to ask such a simple question--but the CCNA book is still unclear as to what's going on. Half-duplex ethernet uses CSMA/CD for arbitration on the link. Does full duplex use it as well for arbitration? The book makes it sound like if you are running full-duplex that the CSMA/CD is not necessary. It mentions half-duplex looping a duplicate frame onto the recieve wire from the transmit wire. Thanks. __ Do You Yahoo!? Send instant messages get email alerts with Yahoo! Messenger. http://im.yahoo.com/ ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ 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: CSMA/CD : full duplex
Further to my original post... It is possible to get collisions on a Full Duplex segment. Transmission from the switch towards the destination is a shared bandwidth domain (with other originating hosts transmitting towards the same destination). As such collisions may occur on the transmit from the switch towards the destination. CSMA/CD is used to overcome this. This may be done internally within the switch (buffering of frames etc) but it is still there... Keith ""Joe Martin"" [EMAIL PROTECTED] wrote in message 8fbq4s$80t$[EMAIL PROTECTED]">news:8fbq4s$80t$[EMAIL PROTECTED]... Full duplex transmission requires a point to point connection between two devices. This is achieved using a switch. Since the connection is between two and only two devices at a time, this allows them to transmit and receive at the same time. Thus a collision would never occur and CSMA/CD is unnecessary. JOE CCNP, CCDP, and a few other things... "Dan West" [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Sorry to ask such a simple question--but the CCNA book is still unclear as to what's going on. Half-duplex ethernet uses CSMA/CD for arbitration on the link. Does full duplex use it as well for arbitration? The book makes it sound like if you are running full-duplex that the CSMA/CD is not necessary. It mentions half-duplex looping a duplicate frame onto the recieve wire from the transmit wire. Thanks. __ Do You Yahoo!? Send instant messages get email alerts with Yahoo! Messenger. http://im.yahoo.com/ ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: CSMA/CD : full duplex
When Cisco says "Full Duplex", they typically refer to the MAC layer function of transmitting and receiving at the same time. This is accomplished on ethernet by uncoupling the Collision Detection circuit, and buffering TX and RX in separate queues. There is no internal 'CSMA/CD' in Cisco switches . flem --- woody [EMAIL PROTECTED] wrote: Further to my original post... It is possible to get collisions on a Full Duplex segment. Transmission from the switch towards the destination is a shared bandwidth domain (with other originating hosts transmitting towards the same destination). As such collisions may occur on the transmit from the switch towards the destination. CSMA/CD is used to overcome this. This may be done internally within the switch (buffering of frames etc) but it is still there... Keith ""Joe Martin"" [EMAIL PROTECTED] wrote in message 8fbq4s$80t$[EMAIL PROTECTED]">news:8fbq4s$80t$[EMAIL PROTECTED]... Full duplex transmission requires a point to point connection between two devices. This is achieved using a switch. Since the connection is between two and only two devices at a time, this allows them to transmit and receive at the same time. Thus a collision would never occur and CSMA/CD is unnecessary. JOE CCNP, CCDP, and a few other things... "Dan West" [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Sorry to ask such a simple question--but the CCNA book is still unclear as to what's going on. Half-duplex ethernet uses CSMA/CD for arbitration on the link. Does full duplex use it as well for arbitration? The book makes it sound like if you are running full-duplex that the CSMA/CD is not necessary. It mentions half-duplex looping a duplicate frame onto the recieve wire from the transmit wire. Thanks. __ Do You Yahoo!? Send instant messages get email alerts with Yahoo! Messenger. http://im.yahoo.com/ ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] __ Do You Yahoo!? Send instant messages get email alerts with Yahoo! Messenger. http://im.yahoo.com/ ___ 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: CSMA/CD : full duplex
Actually CSMA/CD is still required. When communicating through a switch, the TX (towards the switch) is guaranteed the full bandwidth towards the switch. However the inbound (RX from the switch) may be carrying traffic from more than one originating host. As such, collisions may still occur if more than on of these hosts tries to talk to the same destination at the same time. A basic switch (without VLANS and fancy Layer 3 functionality) creates bandwidth domains but NOT broadcast domains. As such it will still flood broadcasts and multicasts to all ports - again creating opportunity for collisions that require CSMA/CD arbitration. Full duplex increases throughput as less traffic is forwarded to end devices (cuts out unicasts not addressed to the attached devices) but does not guarantee collisionless connectivity. CSMA/CD is required to handle the collisions that do occur. Keith ""Joe Martin"" [EMAIL PROTECTED] wrote in message 8fbq4s$80t$[EMAIL PROTECTED]">news:8fbq4s$80t$[EMAIL PROTECTED]... Full duplex transmission requires a point to point connection between two devices. This is achieved using a switch. Since the connection is between two and only two devices at a time, this allows them to transmit and receive at the same time. Thus a collision would never occur and CSMA/CD is unnecessary. JOE CCNP, CCDP, and a few other things... "Dan West" [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... Sorry to ask such a simple question--but the CCNA book is still unclear as to what's going on. Half-duplex ethernet uses CSMA/CD for arbitration on the link. Does full duplex use it as well for arbitration? The book makes it sound like if you are running full-duplex that the CSMA/CD is not necessary. It mentions half-duplex looping a duplicate frame onto the recieve wire from the transmit wire. Thanks. __ Do You Yahoo!? Send instant messages get email alerts with Yahoo! Messenger. http://im.yahoo.com/ ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] --- ___ UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html FAQ, list archives, and subscription info: http://www.groupstudy.com Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
