BGP: Difference between revisions
→MED vs Local Preference
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*The MED is an optional attribute that comes in handy when there are multiple entrance paths to an AS.
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*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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= iBGP vs eBGP =
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