MPLS integration to existing VRFs

[steve martin]

Hello,

My company has recently purchased a mpls solution that configures the WAN and then redistributes back into the LAN at an ASR.  On our core are 3 existing vrfs, that the mpls will need to integrate with.  The main vrf has BGP running within it - so presumably I need to setup a BGP peering and that will advertise the routes back. 

The other two vrf don't have any dynamic routing - these vrfs are flat layer 2 networks that have been rolled out across the network as layer 2 vpls solutions.  The intention was that I would retain the same ip subnets to the new mpls but I'm confused how best to integrate the old flat network with the new layer 3 solution.  How would I best advertise routes between the ASR and the core for these vrfs.  Any advise would be much appreciated.

Steve

[Julio E. Moisa]

Hi

All of the 3 VRFs are being advertised through the MP-BGP?

[steve martin]

Yes that's right,  though I haven't got  access to the configuration on the router.

[Julio E. Moisa]

Hi,

Basically each VRF has its own routing table, so if you want to be able to reach the subnets from each other, you can import the route-targets from each other, for example:

ip vrf A

rd 1:1

route-target export 1:1

route-target import 1:1

route-target import 2:2

route-target import 3:3

ip vrf B

rd 2:2

route-target export 2:2

route-target import 2:2

route-target import 1:1

route-target import 3:3

ip vrf C

rd 3:3

route-target export 3:3

route-target import 3:3

route-target import 1:1

route-target import 2:2

Or

ip vrf A

rd 1:1

route-target export 1:1

route-target import 3:3

ip vrf B

rd 2:2

route-target export 2:2

route-target import 3:3

ip vrf C (MAIN)

rd 3:3

route-target export 3:3

route-target import 3:3

route-target import 1:1

route-target import 2:2

[steve martin]

Thanks for the information, can you just clarify that the routes will appear without any additional configuration.  Will I need to setup an instance of BGP/ or another dynamic routing protocol on the vrfs that currently don't have any routing setup to see those routes.