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IGP choice


On 23/Oct/15 11:00, marcel.duregards at yahoo.fr wrote:

> by having multiple areas, therefore ABR which deny routers and network
> LSA, you introduce summarization (ABR only send summary LSA, mean
> subnet info, not topology info) in your network.
> Thus you loose informations and do not have a complete topology of
> your network. I guess MPLS/TE prefer to seat on top of a real topology ?

Yes, summarization in the IGP has the potential to create blackholes
and/or loops.

This reminds me of:

    http://tools.ietf.org/id/draft-swallow-mpls-aggregate-fec-01.txt

Mark.