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Dell Configuration Guide for the S4048–ON System 9.14.2.4

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Configuring BGP Route Reflectors

BGP route reflectors are intended for ASs with a large mesh; they reduce the amount of BGP control traffic.

NOTE Dell EMC Networking recommends not using multipath and add path simultaneously in a route reflector.

With route reflection configured properly, IBGP routers are not fully meshed within a cluster but all receive routing information.

Configure clusters of routers where one router is a concentration router and the others are clients who receive their updates from the concentration router.

To configure a route reflector, use the following commands.

  • Assign a cluster ID or an IP address to a router reflector cluster.
    CONFIG-ROUTER-BGP mode
    bgp cluster-id ip-address | number
    • ip-address: IP address as the route reflector cluster ID.

    • number: A route reflector cluster ID as a number from 1 to 4294967295.

    You can have multiple clusters in an AS. When a BGP cluster contains only one route reflector, the cluster ID is the route reflector’s router ID. For redundancy, a BGP cluster may contain two or more route reflectors. Without a cluster ID, the route reflector cannot recognize route updates from the other routes reflector within the cluster.
  • Configure the local router as a route reflector and the specified neighbors or peer group as members of the cluster.
    CONFIG-ROUTER-BGP mode
    neighbor {ip-address | ipv6-address | peer-group-name} route-reflector-client
When you enter this command for the first time, the router configures as a route reflector and the specified BGP neighbors configure as clients in the route reflector cluster. When you remove all clients of a route reflector using the no neighbor route-reflector-client command, the router no longer functions as a route reflector. When you enable a route reflector, Dell EMC Networking OS automatically enables route reflection to all clients. To disable route reflection between all clients in this reflector, use the no bgp client-to-client reflection command in CONFIGURATION ROUTER BGP mode. All clients must be fully meshed before you disable route reflection.
To view a route reflector configuration, use the show config command in CONFIGURATION ROUTER BGP mode or the show running-config bgp in EXEC Privilege mode.

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