[c-nsp] MPLS-VPN migration

Tim Durack tdurack at gmail.com
Wed Dec 17 13:21:24 EST 2008

On Wed, Dec 17, 2008 at 12:25 PM, Luan Nguyen <luan at netcraftsmen.net> wrote:
> Let me try thinking out loud :)
> There BGP support for IP prefix import into VRF table:
> http://www.cisco.com/en/US/docs/ios/12_3t/12_3t14/feature/guide/gt_bgivt.htm
> l
> You could use static routes as well.

Looked at that. Trouble is the static routes have to specify next-hop,
which isn't going to be very scalable for directly-connected VLAN

> For dynamic, some people create two tunnels, same router, same subnet,
> sourced from different loopbacks.  With one tunnel interface in the vrf, one
> in the global routing table
> ip vrf CUSTOMER1
> rd
> route-target export
> route-target import
> !
> interface Tunnel100
> bandwidth 50000
> ip vrf forwarding CUSTOMER1
> ip address
> load-interval 30
> tunnel source x.x.x.x
> tunnel destination y.y.y.y
> !
> interface Tunnel200
> bandwidth 50000
> ip address
> ip virtual-reassembly
> load-interval 30
> tunnel source y.y.y.y
> tunnel destination x.x.x.x

And point statics at the tunnel? I guess that could work.

I was hoping to do something along the lines of:


But it looks like this only works for VRF<->VRF BGP sessions, not VRF<->GLOBAL.


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