Folks,

I have been asked to provide an OPS-DIR review of draft-ietf-idr-aigp. Reading the draft, I have one question and one comment:

Question
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Would it be a good idea for BGP speakers to negotiate  Aggregated IGP Metric capability at session initiation?

The text in Section 3.3 helps somewhat. But wouldn't it be neater to deal with configuration mismatches at session initiation time than to ignore mismatches later in the life of the session?

Comment
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The draft might benefit from an Operational Considerations Section. In that section, you might address a scenario in which an AS1 peers with AS2. AS1 contains a relatively small number (<100) of IGP links, but many (>400,000) BGP routes. In AS1, one link flaps slowly. This causes the Aggregated IGP Metric to change for ~100,000 BGP routes and lots of BGP activity between AS1 and AS2.

What steps should be taken at AS1? At AS2?

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Ron Bonica