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Practical BGP by Sangli Srihari, Russ White, Danny McPherson

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Transport-Level Issues

This section covers two transport-level issues relating to BGP performance: fast external fallover and optimizations in the Transport Control Protocol.

Fast External Fallover

BGP typically relies on recursive routing to find peers and learn their status; it cannot rely on direct knowledge at the IP layer for this peer status information. One optimization we can make in this area is to tie the state of a peer to the state of the interface the peer is reachable through; this optimization is called fast external fallover. Figure 5.11 illustrates.

Figure 5.11. Fast external fallover.

Router A is eBGP peering with router C; it ...

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