Deployment Guide

INTERFACE PORT-CHANNEL mode
bfd interval milliseconds min_rx milliseconds multiplier value role [active | passive]
View session parameters using the show bfd neighbors detail command.
Disabling BFD for Port-Channels
If you disable BFD on an interface, sessions on the interface are torn down.
A nal Admin Down control packet is sent to all neighbors, and sessions on the remote system are placed in a Down state.
To disable BFD for a port-channel, use the following command.
• Disable BFD for a port-channel.
INTERFACE PORT-CHANNEL mode
no bfd enable
Conguring Protocol Liveness
Protocol liveness is a feature that noties 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 remote system 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 mode
bfd protocol-liveness
Troubleshooting BFD
To troubleshoot BFD, use the following commands and examples.
To control packet eld values or to examine the control packets in hexadecimal format, use the following command.
• Examine control packet eld values.
CONFIGURATION mode
debug bfd detail
• Examine the control packets in hexadecimal format.
CONFIGURATION
debug bfd packet
Example of Output from the debug bfd detail Command
Example of Output from the debug bfd packet Command
The following example shows a three-way handshake using the debug bfd detail command.
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
Bidirectional Forwarding Detection (BFD)
167