BGP Scalability Features
At the beginning of this chapter, the text noted that a BGP router never advertises IBGP-learned routes to another IBGP neighbor. This implies that all IBGP neighbors must be connected via a full mesh of IBGP peering sessions.
Even in medium-size networks, this full-mesh requirement can lead to serious scaling difficulties. Route reflectors and confederations are two ways of solving the full-mesh problem.
Route Reflectors
Route reflection (RFC 1966) was designed with three goals in mind:
To be simple to understand and configure
To enable easy migration from full-mesh to reflected environments
To be compatible with IBGP routers that do not understand route reflection
Route reflection achieves these goals very well. ...
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