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Practical BGP by Sangli Srihari, Russ White, Danny McPherson

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BGP MED Deployment Considerations

The BGP MED attribute provides a mechanism for BGP speakers to convey to an adjacent AS the optimal entry point into the local AS. While BGP MEDs function correctly in many scenarios, there are a number of issues that may arise when utilizing MEDs in dynamic or complex topologies. This section discusses implementation and deployment considerations regarding BGP MEDs and provides information with which implementers and network operators should be familiar.

The BGP MUTLI_EXIT_DISC (Multi-Exit Discriminator, or MED) attribute, formerly known as the INTER_AS_METRIC, is currently defined in Section 5.1.4 of RFC 1771, as follows:

MULTI_EXIT_DISC is an optional non-transitive attribute which is intended to be used on ...

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