Reroute some vrf traffic between 2 sites over redundant link

[Milan Peyrac]

hey guys,

We have a single client (in vrf) with 2 sites in different states and running over our mpls core.. Our primary link in our core is experiencing degredation of service and want to route this client over our redundant link while keeping all other clients going over our primary link - is this possible?

The client in question has its own vrf (L3VPN) at both sites and is running over mpls between both sites. We want to re-route this particular client to take our backup path, while keeping everyone else between both sites going over the primary. We are not using TE, instead LDP to build MPLS.

I don't believe this is possible to only re-route one client, however I thought I would ask the question.

We cannot failover to secondary link for everyone between both sites because the link doesn't have the capacity.

Thanks in advance.

[Harold Ritter · Accepted solution]

Hi,

Using MPLS TE would certainly be an option. You would need to setup an MPLS TE LSP over the backup. You would also need to configure a separate lookback interface on each PE and use this loopback interface address as the next hop for the specific VRF

ip vrf X

bgp next-hop loopback 999

ip route 255.255.255.255 Tu1

This way you would make sure that only the traffic for this specific VRF would travel over the TE tunnel.

Regards

[Milan Peyrac]

Thanks Harold, makes perfect sense - however for that to happen we would need to enable traffic engineering across our whole network first right?

cheers,

[Harold Ritter]

Hi Milan,

You would need to at least enable MPLS TE on all routers along what you refered to as "the backup path".

Regards

[Milan Peyrac]

Yep Harold - makes perfect sense.

Merry Christmas

[Harold Ritter]

Merry Christmas to you too Milan.