158 | Bidirectional Forwarding Detection (BFD)w w w . d e l l . c o m | s u p p o r t . d e l l . c o m Configuring Protocol LivenessProtocol Liveness is a feature that notifies the BFD Manager when a client protocol is disabled. When aclient is disabled, all BFD sessions for that protocol are torn down. Neighbors on the remote systemreceive an Admin Down control packet and are placed in the Down state (Message 3).To enable Protocol Liveness:Troubleshooting BFDExamine control packet field values using the command debug bfd detail. The following example shows athree-way handshake using this command.Figure 7-29. debug bfd detail Command OutputExamine control packets in hexadecimal format using the command debug bfd packet.Figure 7-30. debug bfd packet Command OutputThe output for the command debug bfd event is the same as the log messages that appear on the console bydefault.Step Task Command Syntax Command Mode1 Enable Protocol Liveness bfd protocol-liveness CONFIGURATIONR1(conf-if-gi-4/24)#00:54:38: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session stateto Down for neighbor 2.2.2.2 on interface Gi 4/24 (diag: 0)00:54:38 : Sent packet for session with neighbor 2.2.2.2 on Gi 4/24TX packet dump:Version:1, Diag code:0, State:Down, Poll bit:0, Final bit:0, Demand bit:0myDiscrim:4, yourDiscrim:0, minTx:1000000, minRx:1000000, multiplier:3, minEchoRx:000:54:38 : Received packet for session with neighbor 2.2.2.2 on Gi 4/24RX packet dump:Version:1, Diag code:0, State:Init, Poll bit:0, Final bit:0, Demand bit:0myDiscrim:6, yourDiscrim:4, minTx:1000000, minRx:1000000, multiplier:3, minEchoRx:000:54:38: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session state to Up for neighbor2.2.2.2 on interface Gi 4/24 (diag: 0)RX packet dump:20 c0 03 18 00 00 00 05 00 00 00 04 00 01 86 a000 01 86 a0 00 00 00 0000:34:13 : Sent packet for session with neighbor 2.2.2.2 on Gi 4/24TX packet dump:20 c0 03 18 00 00 00 04 00 00 00 05 00 01 86 a000 01 86 a0 00 00 00 0000:34:14 : Received packet for session with neighbor 2.2.2.2 on Gi 4/24RX packet dump:20 c0 03 18 00 00 00 05 00 00 00 04 00 01 86 a000 01 86 a0 00 00 00 0000:34:14 : Sent packet for session with neighbor 2.2.2.2 on Gi 4/24TX packet dump:
