5.1.5. LOCAL_PREF

5.1.5. LOCAL_PREF

LOCAL_PREF is a well-known attribute that SHALL be included in all UPDATE messages that a given BGP speaker sends to other internal peers. A BGP speaker SHALL calculate the degree of preference for each external route based on the locally-configured policy, and include the degree of preference when advertising a route to its internal peers. The higher degree of preference MUST be preferred. A BGP speaker uses the degree of preference learned via LOCAL_PREF in its Decision Process (see Section 9.1.1).

A BGP speaker MUST NOT include this attribute in UPDATE messages it sends to external peers, except in the case of BGP Confederations [RFC3065]. If it is contained in an UPDATE message that is received from an external peer, then this attribute MUST be ignored by the receiving speaker, except in the case of BGP Confederations [RFC3065].