Jakob,

On Wed, Jul 12, 2017 at 10:48:28PM +0000, Jakob Heitz (jheitz) wrote:
> Here are some more factors that cause different updates to peers in the same 
> peer-group:
>  - RT Constraint: This filters different updates from different peers.
>  - Refresh requests: Only the peer that sent the request receives the updates.
>  - Nexthop SAFI (future).

You missed simple BGP loop detection such as RRs with cluster list or
originator ID suppression for iBGP or AS_PATH for eBGP.

> IMO, the point of BMP is to take the guess work out of figuring out what was 
> sent.
> Peer-groups will add more guess work.

Much of my point is that even without complicated features, if you care
about per-peer state, you have to monitor *ALL* of the peers.  Otherwise,
you're going to miss things.  There's no "monitor one or two sample peers".  

You either care about the approximate state of the peers in the group or you
care about the exact state.  The use cases are different.

-- Jeff

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