Use the bgp cluster-id command in BGP router configuration mode to specify the cluster ID of a route reflector. To revert the cluster ID to its default, use the no form of this command.
A route reflector and its clients form a cluster. Since a cluster with a single route reflector has a single point of failure, a cluster may be configured with multiple route reflectors. To avoid sending multiple copies of a route to a client, each route reflector in a cluster should be configured with the same cluster ID. Route reflectors with the same cluster ID must have the same set of clients; otherwise, some routes may not be reflected to some clients. The same cluster ID is used for both IPv4 and IPv6 route reflection.
| Default | A route reflector with an unconfigured cluster ID uses its BGP router ID (configured with bgp router-id as the cluster ID. |
| Format | bgp cluster-id cluster-id |
| Mode |
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| Parameter | Description |
|---|---|
| cluster-id | A non-zero 32-bit identifier that uniquely identifies a cluster of route reflectors and their clients. The cluster ID may be entered in dotted notation like an IPv4 address or as an integer. |
