From: sheherezada@gmail.com
Date: Tue Aug 21 2007 - 04:13:12 ART
The second exception mentions that there is full meshing between the
clients. In that case, reflecting a client route to another client,
just takes out resources from the RR, with no real benefit.
To ensure redundancy in the real world, usually you use two route
reflectors at least - of course, if you also have redundant paths to
them. I don't see any reason to peering between the clients in that
case. It is also common to nest route reflectors (also to offload
resources from the main RRs). Say you have two route reflectors in
the core, but some of their clients may have another "local" clients,
at the distribution level, especially if those second level clients do
not have redundant paths to reach the core (i.e. traffic passes
through the first level clients).
Bottom line, I think it is just a matter of preserving computing
resources and memory.
HTH,
Mihai Dumitru
CCIE #16616 (SP, R&S)
On 8/21/07, Bit Gossip <bit.gossip@chello.nl> wrote:
> From Jeff Doyle: "Routing TCP/IP" pag 306:
> "The rule that clients must peer only to their RRs has two exceptions. First,
> a client itself can be a route reflector for another cluster. This allows
> 'nesting' of ruote reflection clusters or the creation of a hierarchy of
> clusters, as illustrated in Figure 2-40 of Chapter 2.
> The second exception is when there is a full IBGP mesh among the clients, as
> shown in Figure 2-41 of Chapter 2. Fully meshing the clients provides some
> increased robustness. When such a design is used, you should configure the
> route reflector with the command no bgp client-to-client reflection."
>
> Why is it not possible to have some clients of the same cluster to peer
> between eachother and at same time with their RR?
> Is it really so bad?
>
> Thanks,
> Bit.
>
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