isis bfd all-neighbors disableConfigure BFD for BGPIn a BGP core network, BFD provides rapid detection of communication failures in BGP fast-forwardingpaths between internal BGP (iBGP) and external BGP (eBGP) peers for faster network reconvergence. BFDfor BGP is supported on 1GE, 10GE, 40GE, port-channel, and VLAN interfaces. BFD for BGP does notsupport IPv6 and the BGP multihop feature.PrerequisitesBefore configuring BFD for BGP, you must first configure the following settings:1. Configure BGP on the routers that you want to interconnect, as described in Border GatewayProtocol IPv4 (BGPv4).2. Enable fast fall-over for BGP neighbors to reduce convergence time (the neighbor fall-overcommand), as described in BGP Fast Fall-Over.Establishing Sessions with BGP NeighborsBefore configuring BFD for BGP, you must first configure BGP on the routers that you want tointerconnect.For more information, refer to Border Gateway Protocol IPv4 (BGPv4).For example, the following illustration shows a sample BFD configuration on Router 1 and Router 2 thatuse eBGP in a transit network to interconnect AS1 and AS2. The eBGP routers exchange information witheach other as well as with iBGP routers to maintain connectivity and accessibility within eachautonomous system.Figure 16. Establishing Sessions with BGP NeighborsBidirectional Forwarding Detection (BFD) 145
