On 12/Mar/18 16:19, adamv0...@netconsultings.com wrote:

> In iBGP infrastructures I used or built the use of common/unique cluster IDs 
> is not saving any memory and is used solely for preventing a RR to learn its 
> own advertisements from the network.  

That saves RAM, otherwise with unique Cluster-ID's, RR's in will
exchange client routes with each other, using up RAM.

But this only applies to client routes. Routes originated by the RR are
learned by neighbor RR's in a shared Cluster-ID scenario, which is useful.

Mark.
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