when i design mpls vpn ,can i use multi area in global igp routing design. is there any problem in TE or mpls vpn
i saw many design just use one area 0 for global igp
As long as you have host routes in all routers for all BGP next hops, i.e. PE loopbacks, there is no problem. MPLS really does not care how a route is inserted into the RIB and has no knowledge about routing topology.
So as long as you only use MPLS L3VPN and do not summarize the loopback networks you are fine.
Just as a side note: in general 150 routers of type 7600 in a single area should not pose a problem. The 7600 have enough memory and cpu power to deal with that. Of course there might be other reasons I do not know of leading to a multi-area design.
Hope this helps! Please rate all posts.