Nokia Voyager Reference Manual page 290

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Configuring Routing

No special configuration is required on the route reflection clients. From a

client's perspective, a route reflector is simply a normal IBGP peer. Any BGP

version 4 speaker should be able to be a reflector client.

Please refer to the route reflection specification document (RFC 1966 as of

this writing) for further details.

AS1 has five BGP-speaking routers. With Router B working as a route

reflector, there is no need to have all the routers connected in a full mesh.

Confederations

An alternative to route reflection is BGP confederations. As with route

reflectors, BGP speakers may be partitioned into clusters where each cluster is

typically a topologically-close set of routers. With confederations, this is

accomplished by subdividing the autonomous system into multiple, smaller

ASes that communicate among themselves. The internal topology is hidden

from the outside world; this simply perceives the confederation to be one

Each distinct sub-AS within a confederation is referred to as a routing domain

(RD). Routing domains are identified by using a routing domain identifier

(RDI). The RDI has the same syntax as an AS number, but as it is not visible

outside of the confederation so it does not need to be globally unique,

although it does need to be unique within the confederation. Many

Route Reflector

Voyager Reference Guide