In an IBGP network, the route reflector mechanism is used to reduce the number of BGP sessions required. Without route reflectors, every BGP router in the network would need to establish a session with every other BGP router (full mesh), which becomes inefficient in large networks.
The route reflector itself is set up on the BGP router that will act as the central point for routing updates.
On the client routers, you configure route-reflector-client enable to designate them as clients of the route reflector.
Summary:
To reduce the number of IBGP sessions, configure a router as a route reflector, and set route-reflector-client enable on its clients. Let me know if you need further clarification!
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