However, this requirement does not scale well when there are many iBGP speakers. RR is configured as a route reflector redistributing routes among the connected internal peers. BGP Route Reflector BGP requires that all iBGP speakers be fully meshed. You simply establish a BGP session from the route reflector to each internal peer and the iBGP full-mesh requirement is met.įigure 1 shows the configuration of a single cluster with one route reflector. A route reflector is not limited by the re-advertising restriction anymore, allowing it to share routes with other iBGP speakers. Using the route reflection principle you can designate one or several of your routers as route reflectors. Placement of BGP route reflectors on the spine layer is an intuitive design for MP-iBGP EVPN. iBGP neither has any loop prevention mechanism, and this is why you require route reflectors to be setup for large networks. Because of that, the routers should be fully interconnected, hence the full mesh requirement. IBGP has the restriction of not allowing to redistribute the learned routes to other internal peers. Route reflection enables sharing of routing information among multiple routers without having to send the exact same information to each of them individually. Route reflection comes to solve the complexity of multiple peering configuration. Therefore, in a large network, the full-mesh requirement for iBGP can be a big challenge. The route reflector allows all IBGP speakers within your autonomous system to learn about the available routes without creating loops. With the add-path receive configuration, Router R4 is configured to receive multiple. With the add-path send path-count 6 configuration, Router R1 is configured to send up to six paths (per destination) to Router R4. Route reflection is optional when multiple-path advertisement is enabled in BGP. Because of the increasing numbers of iBGP sessions the possibilities of scaling are limited. Route reflectors (RR) are one of the methods to get rid of the full-mesh of IBGP peers in your network. Router R8 is a client to Route Reflector R4. The typical fully-meshed iBGP configuration of routers can become very difficult to manage in large networks.
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