We all know that BGP responds very slowly to changes in network topology, right? Wrong! When Cisco's engineers fixed the IOS BGP code, they dramatically improved BGP's response times. In the March IP Corner article, Designing Fast Converging BGP Networks, I'm describing one of the new features, the BGP fast peering session deactivation, including in-depth description of how it works, design guidelines and recently added options that are not well explained in Cisco's documentation (one of the features is so new it's been working properly only since 12.4(15)T3).
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