Summary

• Some customers need redundant Internet access for their mission-critical applications and address this need by having two separate connections to one ISP or implementing a multihomed configuration (connecting to two different Internet service providers).

• The multihomed customer network must exchange BGP information with both ISP networks. Dynamic routing is required for full redundancy, and BGP is the only protocol available that can be used in this scenario.

• An approach to multihoming that is too simple can be a source of problems. Starting BGP sessions and announcing customer networks to multiple ISPs by using the default behavior of BGP may not result in optimal routing.

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