BGP: Difference between revisions

*The MED is an optional attribute that comes in handy when there are multiple entrance paths to an AS.

*The remote AS sets MED values to tell the other AS which path to use.

*The MED is passed between the two autonomous systems, but the value is not passed to any other ASes.

*The path with the lowest MED is the preferred path.

*This attribute is only used to influence entry INTO the AS.

*LOCAL_PREF is a well-known attribute that is also used when multiple paths between autonomous systems exist.

*The LOCAL_PREF attribute is just that… local and exclusive to the AS.

*Routers within the local AS are told what path to use to exit that AS.

*The local preference value is passed only among iBGP peers, and this value never leaves the local AS.

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