[j-nsp] router reflector clients and non-clients

[adamv0025 at netconsultings.com]

> From: Victor Sudakov [mailto:vas at mpeks.tomsk.su]
> Sent: Wednesday, May 30, 2018 8:57 AM
> 
> adamv0025 at netconsultings.com wrote:
> > > Of Victor Sudakov
> > > Sent: Wednesday, May 30, 2018 8:07 AM
> > >
> > > Alan Gravett wrote:
> > > > A RR can also be a client with hierarchical RR's...
> > >
> > > A hierarchy is irrelevant for this discussion. We are talking about
> > > how a
> > RR
> > > should differentiate between
> > >
> > > 1. Its clients
> > >
> > > 2. Non-clients
> > >
> > > 3. Non-clients which are also RRs in the same cluster (from which
> > > you should reject updates based on the cluster-id attribute).
> > >
> > I know what you're talking about,
> 
> Thank you!
> 
> > Even if you configure the other RR as a non-client in its dedicated
> > peer-group router will know what to do and will drop updates based on
> > common cluster-ID
> 
> Oh!
> 
> > -eve cluster-ID is configured under peer-group it's a global BGP
> > attribute,
> 
> Oh! That's what I wanted to hear. The matter is much clearer now.
> 
> > but let me ask you this instead.
> > Why would you even connect RR1 and RR2 if they are in the same cluster
> > -why to bother exchanging routes between the RRs just to be dropped by
> > the receiving party.
> 
> Well, they are not dedicated RRs, they are part of the full mesh and have
> other functions. That's probably the only reason.
> 
I see, so you in fact you actually need to exchange prefixes between the two
nodes, just want to be able to drop the unnecessary/redundant stuff. 
Thinking about it maybe even better solution would be not to advertise the
routes rather than dropping them on the receiving node.
BUT THIS WILL BOUNCE THE SESSION:
On RR1 you can accomplish the above by applying export policy on the RR2
peer, matching for the cluster-id and let those prefixes to be
stripped/dropped from the advertisements to RR2)
BUT THIS WILL BOUNCE THE SESSION to RR2. 
(and the session would bounce again when you'd be doing the same from RR2
perspective)


adam

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