• Disable a BFD for BGP session with a specified neighbor.ROUTER BGP modeneighbor {ip-address | peer-group-name} bfd disable• Remove the disabled state of a BFD for BGP session with a specified neighbor.ROUTER BGP modeno neighbor {ip-address | peer-group-name} bfd disableUse BFD in a BGP Peer GroupYou can establish a BFD session for the members of a peer group (the neighbor peer-group-name bfdcommand in ROUTER BGP configuration mode).Members of the peer group may have BFD:• Explicitly enabled (the neighbor ip-address bfd command)• Explicitly disabled (the neighbor ip-address bfd disable command)• Inherited (neither explicitly enabled or disabled) according to the current BFD configuration of the peergroup. For information about BGP peer groups, refer to Configure Peer Groups.If you explicitly enable (or disable) a BGP neighbor for BFD that belongs to a peer group:• The neighbor does not inherit the BFD enable/disable values configured with the bfd all-neighborscommand or configured for the peer group to which the neighbor belongs.• The neighbor inherits only the global timer values that are configured with the bfd all-neighborscommand (interval, min_rx, and multiplier).If you explicitly enable (or disable) a peer group for BFD that has no BFD parameters configured (for example,advertisement interval) using the neighbor peer-group-name bfd command, the peer group inherits anyBFD settings configured with the bfd all-neighbors command.Displaying BFD for BGP InformationYou can display related information for BFD for BGP.To display information about BFD for BGP sessions on a router, use the following commands and refer to thefollowing examples.• Verify a BFD for BGP configuration.EXEC Privilege modeshow running-config bgp• Verify that a BFD for BGP session has been successfully established with a BGP neighbor. A line-by-linelisting of established BFD adjacencies is displayed.EXEC Privilege modeshow bfd neighbors [interface] [detail]• Check to see if BFD is enabled for BGP connections.EXEC Privilege modeshow ip bgp summary• Displays routing information exchanged with BGP neighbors, including BFD for BGP sessions.Bidirectional Forwarding Detection (BFD) 183
