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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