Re: does vtp can span the router [7:18545]
sorry, test only Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18568t=18545 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: does vtp can span the router [7:18545]
I believe it means that the router will not listen to the vtp messages. It will also not pass them along- it is strictly layer 2. From: Guest Reply-To: Guest To: [EMAIL PROTECTED] Subject: does vtp can span the router [7:18545] Date: Tue, 4 Sep 2001 23:54:23 -0400 i am reading the cit 4.1 ppt,on page 19,it says a router will be transparent for VTP(forward messages). what is that mean? _ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18590t=18545 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: does vtp can span the router [7:18545]
I believe it means that the router will not listen to the vtp messages. It will also not pass them along- it is strictly layer 2. pass them along,you mean just transfer it ,right?but i don't know where it go,see my last message,i dont know which vlan can carry vtp,or like cdp-a purely layer 2 protocol, does vtp indepent of vlan,it runs on native vlan?? i dont find ways to prove it. anyway ,thanks a lot Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18606t=18545 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: does vtp can span the router [7:18545]
VTP runs only on VLAN 1. Anyone know (or can test) what will happen in this topology: [SwitchA] -- isl trunk -- [Router] -- isl trunk -- [SwitchB] If router is configured for pure bridging between two ports, will VTP messages pass through it ? If yes, then answer to the original questions is yes, router is vtp transparent. Sasa i dont know which vlan can carry vtp,or like cdp-a purely layer 2 protocol, does vtp indepent of vlan,it runs on native vlan?? Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18634t=18545 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: does vtp can span the router [7:18545]
A VTP transparent device does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements. However, VTP-transparent devices do forward received VTP advertisements to other devices. I can imagine a situation where a router with VLANs implemented is sitting in the middle of a Layer 2 topology and you want the router to be in VTP transparent mode so that it passes VTP advertisements onto switches on the other side of it. It doesn't seem like a very good design, but it could happen. Priscilla At 10:19 AM 9/5/01, Guest wrote: I believe it means that the router will not listen to the vtp messages. It will also not pass them along- it is strictly layer 2. pass them along,you mean just transfer it ,right?but i don't know where it go,see my last message,i dont know which vlan can carry vtp,or like cdp-a purely layer 2 protocol, does vtp indepent of vlan,it runs on native vlan?? i dont find ways to prove it. anyway ,thanks a lot Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18648t=18545 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: does vtp can span the router [7:18545]
Does a VTP advertisement have a layer 3 address? I thought these were only heard within a broadcast domain. How does the router know who to pass these to on the other side? From: Priscilla Oppenheimer Reply-To: Priscilla Oppenheimer To: [EMAIL PROTECTED] Subject: Re: does vtp can span the router [7:18545] Date: Wed, 5 Sep 2001 13:51:37 -0400 A VTP transparent device does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements. However, VTP-transparent devices do forward received VTP advertisements to other devices. I can imagine a situation where a router with VLANs implemented is sitting in the middle of a Layer 2 topology and you want the router to be in VTP transparent mode so that it passes VTP advertisements onto switches on the other side of it. It doesn't seem like a very good design, but it could happen. Priscilla At 10:19 AM 9/5/01, Guest wrote: I believe it means that the router will not listen to the vtp messages. It will also not pass them along- it is strictly layer 2. pass them along,you mean just transfer it ,right?but i don't know where it go,see my last message,i dont know which vlan can carry vtp,or like cdp-a purely layer 2 protocol, does vtp indepent of vlan,it runs on native vlan?? i dont find ways to prove it. anyway ,thanks a lot Priscilla Oppenheimer http://www.priscilla.com _ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18662t=18545 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: does vtp can span the router [7:18545]
VTP advertisements are sent to a data-link-layer multicast 01-00-0C-CC-CC-CC. The SNAP type is 2003 which distinguishes the frame from other Cisco frames that use that multicast (CDP and DISL, for example). As I said before, the router would have to be sitting in the middle of a Layer-2 topology. For example, a one-armed router would pass VTP from one subinterface to another, wouldn't it?? I'm just trying to explain the statement from a CIT book about the router being in VTP transparent mode, which was the original question. Perhaps someone else has more details. Priscilla At 06:29 PM 9/5/01, Jeff Smith wrote: Does a VTP advertisement have a layer 3 address? I thought these were only heard within a broadcast domain. How does the router know who to pass these to on the other side? From: Priscilla Oppenheimer Reply-To: Priscilla Oppenheimer To: [EMAIL PROTECTED] Subject: Re: does vtp can span the router [7:18545] Date: Wed, 5 Sep 2001 13:51:37 -0400 A VTP transparent device does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements. However, VTP-transparent devices do forward received VTP advertisements to other devices. I can imagine a situation where a router with VLANs implemented is sitting in the middle of a Layer 2 topology and you want the router to be in VTP transparent mode so that it passes VTP advertisements onto switches on the other side of it. It doesn't seem like a very good design, but it could happen. Priscilla At 10:19 AM 9/5/01, Guest wrote: I believe it means that the router will not listen to the vtp messages. It will also not pass them along- it is strictly layer 2. pass them along,you mean just transfer it ,right?but i don't know where it go,see my last message,i dont know which vlan can carry vtp,or like cdp-a purely layer 2 protocol, does vtp indepent of vlan,it runs on native vlan?? i dont find ways to prove it. anyway ,thanks a lot Priscilla Oppenheimer http://www.priscilla.com _ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18667t=18545 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: does vtp can span the router [7:18545]
Priscilla Oppenheimer wrote: VTP advertisements are sent to a data-link-layer multicast 01-00-0C-CC-CC-CC. The SNAP type is 2003 which distinguishes the frame from other Cisco frames that use that multicast (CDP and DISL, for example). As I said before, the router would have to be sitting in the middle of a Layer-2 topology. For example, a one-armed router would pass VTP from one subinterface to another, wouldn't it?? I'm just trying to explain the statement from a CIT book about the router being in VTP transparent mode, which was the original question. Perhaps someone else has more details. I don't believe the router is going to forward any VTP datagrams at all, not between interfaces or subinterfaces. That is unless it is a BRouter with bridging enabled. :-) - Marty Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18690t=18545 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: does vtp can span the router [7:18545]
Since VTP uses only VLAN 1, that means that VTP messages won't be passed from one subinterface to another, on the same trunk, since you can have only one subinterface assigned to VLAN 1. Regarding passing VTP messages from one trunk to another ... From http://www.cisco.com/warp/public/473/40.html: The Catalyst 4908G-L3 does not support several Layer 2-oriented protocols, such as VTP, DTP, and PAgP, found on other Catalyst switches Also: In this example, the Catalyst 3512XL switches are configured in VTP transparent mode because a VTP domain cannot be extended across the Catalyst 4908G-L3. I would say that routers, as L3 devices, don't propagete VTP messages from one trunk to another. Sasa Priscilla Oppenheimer wrote: VTP advertisements are sent to a data-link-layer multicast 01-00-0C-CC-CC-CC. The SNAP type is 2003 which distinguishes the frame from other Cisco frames that use that multicast (CDP and DISL, for example). As I said before, the router would have to be sitting in the middle of a Layer-2 topology. For example, a one-armed router would pass VTP from one subinterface to another, wouldn't it?? I'm just trying to explain the statement from a CIT book about the router being in VTP transparent mode, which was the original question. Perhaps someone else has more details. Priscilla At 06:29 PM 9/5/01, Jeff Smith wrote: Does a VTP advertisement have a layer 3 address? I thought these were only heard within a broadcast domain. How does the router know who to pass these to on the other side? From: Priscilla Oppenheimer Reply-To: Priscilla Oppenheimer To: [EMAIL PROTECTED] Subject: Re: does vtp can span the router [7:18545] Date: Wed, 5 Sep 2001 13:51:37 -0400 A VTP transparent device does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements. However, VTP-transparent devices do forward received VTP advertisements to other devices. I can imagine a situation where a router with VLANs implemented is sitting in the middle of a Layer 2 topology and you want the router to be in VTP transparent mode so that it passes VTP advertisements onto switches on the other side of it. It doesn't seem like a very good design, but it could happen. Priscilla At 10:19 AM 9/5/01, Guest wrote: I believe it means that the router will not listen to the vtp messages. It will also not pass them along- it is strictly layer 2. pass them along,you mean just transfer it ,right?but i don't know where it go,see my last message,i dont know which vlan can carry vtp,or like cdp-a purely layer 2 protocol, does vtp indepent of vlan,it runs on native vlan?? i dont find ways to prove it. anyway ,thanks a lot Priscilla Oppenheimer http://www.priscilla.com _ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18691t=18545 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: does vtp can span the router [7:18545]
I should have stuck to my original statement that the router would have to be siting in the middle of a Layer 2 topology (i.e. a bridged network with the router doing bridging). Thanks for the update. A router (doing routing, not bridging) divides up VTP domains then. I guess that's a good thing as long as you realize that this is the case. Priscilla At 05:26 PM 9/5/01, Sasa Milic wrote: Since VTP uses only VLAN 1, that means that VTP messages won't be passed from one subinterface to another, on the same trunk, since you can have only one subinterface assigned to VLAN 1. Regarding passing VTP messages from one trunk to another ... From http://www.cisco.com/warp/public/473/40.html: The Catalyst 4908G-L3 does not support several Layer 2-oriented protocols, such as VTP, DTP, and PAgP, found on other Catalyst switches Also: In this example, the Catalyst 3512XL switches are configured in VTP transparent mode because a VTP domain cannot be extended across the Catalyst 4908G-L3. I would say that routers, as L3 devices, don't propagete VTP messages from one trunk to another. Sasa Priscilla Oppenheimer wrote: VTP advertisements are sent to a data-link-layer multicast 01-00-0C-CC-CC-CC. The SNAP type is 2003 which distinguishes the frame from other Cisco frames that use that multicast (CDP and DISL, for example). As I said before, the router would have to be sitting in the middle of a Layer-2 topology. For example, a one-armed router would pass VTP from one subinterface to another, wouldn't it?? I'm just trying to explain the statement from a CIT book about the router being in VTP transparent mode, which was the original question. Perhaps someone else has more details. Priscilla At 06:29 PM 9/5/01, Jeff Smith wrote: Does a VTP advertisement have a layer 3 address? I thought these were only heard within a broadcast domain. How does the router know who to pass these to on the other side? From: Priscilla Oppenheimer Reply-To: Priscilla Oppenheimer To: [EMAIL PROTECTED] Subject: Re: does vtp can span the router [7:18545] Date: Wed, 5 Sep 2001 13:51:37 -0400 A VTP transparent device does not advertise its VLAN configuration and does not synchronize its VLAN configuration based on received advertisements. However, VTP-transparent devices do forward received VTP advertisements to other devices. I can imagine a situation where a router with VLANs implemented is sitting in the middle of a Layer 2 topology and you want the router to be in VTP transparent mode so that it passes VTP advertisements onto switches on the other side of it. It doesn't seem like a very good design, but it could happen. Priscilla At 10:19 AM 9/5/01, Guest wrote: I believe it means that the router will not listen to the vtp messages. It will also not pass them along- it is strictly layer 2. pass them along,you mean just transfer it ,right?but i don't know where it go,see my last message,i dont know which vlan can carry vtp,or like cdp-a purely layer 2 protocol, does vtp indepent of vlan,it runs on native vlan?? i dont find ways to prove it. anyway ,thanks a lot Priscilla Oppenheimer http://www.priscilla.com _ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp Priscilla Oppenheimer http://www.priscilla.com Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7i=18700t=18545 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
