In larger networks, the overhead needed to implement the IBGP full-mesh requirement is prohibitive. Many networks use route reflectors to avoid having to configure an internal connection to each node for every new router.
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Note: You must have an Advanced BGP Feature license installed on each device that uses a route reflector. For license details, see the JUNOS Software Administration Guide. |
A route reflector can readvertise routes learned through BGP to its BGP neighbors. If you define clusters of routers and configure a single router as a route reflector within each cluster, a full mesh is required only between the route reflectors and all their internal peers within the network. The route reflector is responsible for propagating BGP routes throughout the cluster.
For more information about route reflectors, see Route Reflectors—for Added Hierarchy