03-13-2015 09:34 AM - edited 03-05-2019 01:01 AM
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?
03-13-2015 09:47 AM
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
03-13-2015 10:16 AM
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.
03-13-2015 12:48 PM
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
03-13-2015 01:41 PM
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
03-13-2015 01:56 PM
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
03-14-2015 12:35 AM
Hello ,
VTP will come in picture ,when you are connecting routers using trunk link. but you are configuring router interface L3 interface , .
Regards
Jatinder
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