CLUSTER_LIST is a optional nontransitive attribute.Is a list of Cluster IDs that an update has traversed. When a Route Reflector sends a route, received from a client to a non-client, it appends the local Cluster ID to the CLUSTER_LIST.
It is another loop prevention mechanism used in Route Refelction idea. When RR received an update, it first checks the CLUSTER_LIST. If it sees its own Cluster ID in the list, it knows that a routing loop has occured and ignores the update.
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