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Bidirectional Forwarding Detection | 203
To disable BFD for a port-channel:
Configuring Protocol Liveness
Protocol Liveness is a feature that notifies the BFD Manager when a client protocol is disabled. When a
client is disabled, all BFD sessions for that protocol are torn down. Neighbors on the remote system
receive an Admin Down control packet and are placed in the Down state (Message 3 on page 179).
To enable Protocol Liveness:
Troubleshooting BFD
Examine control packet field values using the command debug bfd detail. Figure 9-29 shows a three-way
handshake using this command.
Figure 9-29. debug bfd detail Command Output
Examine control packets in hexadecimal format using the command debug bfd packet.
Step Task Command Syntax Command Mode
1 Disable BFD for a port-channel.
no bfd enable
INTERFACE PORT-CHANNEL
Step Task Command Syntax Command Mode
1 Enable Protocol Liveness
bfd protocol-liveness
CONFIGURATION
R1(conf-if-gi-4/24)#00:54:38: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session state
to 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 4/24
TX packet dump:
Version:1, Diag code:0, State:Down, Poll bit:0, Final bit:0, Demand bit:0
myDiscrim:4, yourDiscrim:0, minTx:1000000, minRx:1000000, multiplier:3, minEchoRx:0
00:54:38 : Received packet for session with neighbor 2.2.2.2 on Gi 4/24
RX packet dump:
Version:1, Diag code:0, State:Init, Poll bit:0, Final bit:0, Demand bit:0
myDiscrim:6, yourDiscrim:4, minTx:1000000, minRx:1000000, multiplier:3, minEchoRx:0
00:54:38: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session state to Up for neighbor
2.2.2.2 on interface Gi 4/24 (diag: 0)