Users Guide

Local Preference
Local preference (LOCAL_PREF) represents the degree of preference within the entire AS. The higher the number, the greater the
preference for the route.
Local preference (LOCAL_PREF) is one of the criteria used to determine the best path, so keep in mind that other criteria may impact
selection, as shown in the illustration in Best Path Selection Criteria. For this example, assume that thelocal preference (LOCAL_PREF) is
the only attribute applied. In the following illustration, AS100 has two possible paths to AS 200. Although the path through Router A is
shorter (one hop instead of two), the LOCAL_PREF settings have the preferred path go through Router B and AS300. This is advertised to
all routers within AS100, causing all BGP speakers to prefer the path through Router B.
Figure 20. BGP Local Preference
Multi-Exit Discriminators (MEDs)
If two ASs connect in more than one place, a multi-exit discriminator (MED) can be used to assign a preference to a preferred path.
MED is one of the criteria used to determine the best path, so keep in mind that other criteria may impact selection, as shown in the
illustration in Best Path Selection Criteria.
One AS assigns the MED a value and the other AS uses that value to decide the preferred path. For this example, assume the MED is the
only attribute applied. In the following illustration, AS100 and AS200 connect in two places. Each connection is a BGP session. AS200 sets
the MED for its T1 exit point to 100 and the MED for its OC3 exit point to 50. This sets up a path preference through the OC3 link. The
MEDs are advertised to AS100 routers so they know which is the preferred path.
MEDs are non-transitive attributes. If AS100 sends an MED to AS200, AS200 does not pass it on to AS300 or AS400. The MED is a locally
relevant attribute to the two participating ASs (AS100 and AS200).
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Border Gateway Protocol (BGP)