MPLS Redundant PE Best Practice

[joshuacmoore]

Hello,

I am working on a proof of concept for a design theory and am wondering what is the best practice configuration for having a redundant (multihomed) PE router?

The PE router will use OSPF as the IGP (just like the P routers in the core) and the idea is to be able to terminate L2VPNs to the PE router. The question though is what is the best way to setup the IGP as to not have the PE ever participate in core traffic flow? I know I would normally configure this router in a non-MPLS environment to use NSSA area type with the no-summary command so that it simply receives two default routes.

[Akash Agrawal]

To avoid PE router becoming transit for other PE, you can put PE routers in different area (non backbone area) and core in area 0. non backbone area can not become transit to reach other area.

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Regards,

Akash

[joshuacmoore]

I know this is common sense OSPF 101 stuff but where exactly is the limitation defined/applied that non-backbone area cannot become transit?