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Cisco® BGP-4 Command and Configuration Handbook (CCIE Professional Development) by William R. Parkhurst Ph.D.

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3-6. bgp cluster-id 32-bit_id

Syntax Description:

32-bit_id— Route reflector cluster ID entered as either a 32-bit number or an IP address.

Purpose: EBGP loop detection is based on the AS-path attribute. If a BGP router receives an update from an EBGP peer containing the local AS number, the update is ignored. The AS-path method of loop detection does not work when you're using route reflectors, because the reflector and the clients are in the same AS. A route reflector generates an originator ID assigned from the router ID. When you're using multiple route reflectors, the route reflectors in the same cluster must be configured with the same ID, called the cluster ID. A cluster consists of the router reflectors and their clients. The cluster ...

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