ROUTER-ISIS mode
no bfd all-neighbors
• Disable BFD sessions with IS-IS neighbors on a single interface.
INTERFACE mose
isis bfd all-neighbors disable
Congure BFD for BGP
In a BGP core network, BFD provides rapid detection of communication failures in BGP fast-forwarding paths between internal BGP (iBGP)
and external BGP (eBGP) peers for faster network reconvergence. BFD for BGP is supported on 1GE, 10GE, port-channel, and VLAN
interfaces. BFD for BGP does not support IPv6 and the BGP multihop feature.
Prerequisites
Before conguring BFD for BGP, you must rst congure the following settings:
1 Congure BGP on the routers that you want to interconnect, as described in Border Gateway Protocol IPv4 (BGPv4).
2 Enable fast fall-over for BGP neighbors to reduce convergence time (the neighbor fall-over command), as described in BGP
Fast Fall-Over
.
Establishing Sessions with BGP Neighbors
Before conguring BFD for BGP, you must rst congure BGP on the routers that you want to interconnect.
For more information, refer to Border Gateway Protocol IPv4 (BGPv4).
For example, the following illustration shows a sample BFD conguration on Router 1 and Router 2 that use eBGP in a transit network to
interconnect AS1 and AS2. The eBGP routers exchange information with each other as well as with iBGP routers to maintain connectivity
and accessibility within each autonomous system.
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Bidirectional Forwarding Detection (BFD)
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