Will 2 routers running in server mode with no vtp domain defined conflict with each other when connecting over layer 2 sonet?

[douglas.mckee]

Our remote site has a 3845 router running MPLS to connect back to our other 3845 locally. The ISP has provided us a layer 2 sonet connection with no other configurations necessary with the exception of configuring the layer 2 portion on our side. Both of these 3845 routers are in "server mode" with "no vtp domain" specified. Will this cause an issue/conflict when the remote router bypasses the MPLS for the faster 100MB layer 2 connection?

[Jon Marshall]

Douglas

Not sure I follow.

Even if it is L2 connection can you not connect to routed ports on each router ie. use a /30 subnet for the connection and route between sites ?

Edit - this may be down to my lack of knowledge on SONET so maybe the above is not applicable.

Is the connection going to be a trunk port ?

Jon

[douglas.mckee]

We will be configuring a /252 on each of the Gig0/1 ports of the 3845 routers. After we're able to ping back and forth we will be placing that network into OSPF on each of the routers.

[Jon Marshall]

So they are routed ports.

In which cause VTP will not go over that link because your ports are L3 and VTP requires a trunk link.

Perhaps I am misunderstanding the setup ?

Jon

[douglas.mckee]

Jon,

Excellent answer. Our two 3845 routers are about 400 miles away and we're trying to bring up a layer 2 100MB sonet connection over fiber connected to the GIG0/1 port on each router. I was worried that essentially having these 2 routers back to back over layer 2 may cause issues since our remote site has a higher revision number than our local site. It appears since we're configuring an ip address on each router and then adding the network to ospf this shouldn't conflict with our 2 routers. Below is how each router VTP is configured with the exception our remote site has 1 extra VLAN and a higher revision number.

VTP Version                     : 2

Configuration Revision          : 0

Maximum VLANs supported locally : 68

Number of existing VLANs        : 5

VTP Operating Mode              : Server

VTP Domain Name                 :

VTP Pruning Mode                : Disabled

VTP V2 Mode                     : Disabled

VTP Traps Generation            : Enabled

MD5 digest                      : 0xBF 0x86 0x94 0x45 0xFC 0xDF 0xB5 0x70

[Jon Marshall]

I think it was the bit when you talked about configuring the L2 part on your side that threw me.

I envisaged you extending a vlan across the link but if you are using the onboard ports these can only be L3 as far as I am aware and so it is just a routed P2P link as far as I can see.

Jon

[jatinder sharma]

Hello ,

VTP will come in picture ,when you are connecting routers using trunk link. but you are configuring router interface L3 interface  , .

Regards

Jatinder