Disabling BFD for VRRPIf you disable any or all VRRP sessions, the sessions are torn down.A final Admin Down control packet is sent to all neighbors and sessions on the remote system change tothe Down state.To disable all VRRP sessions on an interface, sessions for a particular VRRP group, or for a particular VRRPsession on an interface, use the following commands.• Disable all VRRP sessions on an interface.INTERFACE modeno vrrp bfd all-neighbors• Disable all VRRP sessions in a VRRP group.VRRP modebfd disable• Disable a particular VRRP session on an interface.INTERFACE modeno vrrp bfd neighbor ip-addressConfiguring Protocol LivenessProtocol liveness is a feature that notifies the BFD manager when a client protocol is disabled.When you disable a client, all BFD sessions for that protocol are torn down. Neighbors on the remotesystem receive an Admin Down control packet and are placed in the Down state.To enable protocol liveness, use the following command.• Enable Protocol Liveness.CONFIGURATION modebfd protocol-livenessTroubleshooting BFDTo troubleshoot BFD, use the following commands and examples.To control packet field values or to examine the control packets in hexadecimal format, use the followingcommand.• Examine control packet field values.CONFIGURATION modedebug bfd detail• Examine the control packets in hexadecimal format.CONFIGURATIONdebug bfd packetExample of Output from the debug bfd detail CommandExample of Output from the debug bfd packet CommandThe following example shows a three-way handshake using the debug bfd detail command.Bidirectional Forwarding Detection (BFD) 163
