[c-nsp] Peering between route reflectors

[Lee Clark]

> What about building RR trees...
> Parent RRs serving some child RRs?
> I think I heard something like this sometime...

Hierarchical route reflection may be what you're thinking of. A top level of fully meshed RRs with a second tier of RR clients which act as RRs to another subset of clients.

Gert's got it, a network with a massive # of clients may justify hierarchical RRs although the design might be a throwback to the days of small boxes with minimal memory. Today's control plane only systems can scale to hundreds if not thousands of clients. Hierarchy might be useful if the second tier RRs are in the forwarding path and need to conserve resources for something other than BGP.

Just curious, anyone out there using hierarchical RRs?

Lee