[c-nsp] MPLS-VPN migration

Tim Durack tdurack at gmail.com
Wed Dec 17 10:54:09 EST 2008

Looking for some "creative" ideas on how best to accomplish this:

We are migrating a traditional enterprise-style IP network to an
MPLS-VPN network. All the infrastructure MPLS/IGP/MP-BGP work is
essentially done (it's a purely PE-PE network, no P routers anywhere.)

All "customer" networks are still in the global table. I need to
migrate them into VPN groups, but maintain full reachability between
global and VRFs during the migration. Route-leaking will be configured
between VRFs, and at a later stage some kind of firewall will be
employed between VPNs. The hard part is getting everything into the
VPNs first (without anyone noticing too much :-)

Ideally I'd like to bring up BGP sessions between the global table and
VRFs on each PE. I notice I can do BGP sessions between VRFs, but
can't quite wrap my head around global->VRF BGP. Is this even

Thanks for thinking about it.


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