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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Troubleshooting BFD

To troubleshoot BFD, use the following commands and examples.

To control packet field values or to examine the control packets in hexadecimal format, use the following command.
  • Examine control packet field 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

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
                                 
                                 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)

The following example displays hexadecimal output from the debug bfd packet command. 

RX packet dump:
                                 20 c0 03 18 00 00 00 05 00 00 00 04 00 01 86 a0
                                 00 01 86 a0 00 00 00 00
                                 00:34:13 : Sent packet for session with neighbor 2.2.2.2 on Gi 4/24
                                 TX packet dump:
                                 20 c0 03 18 00 00 00 04 00 00 00 05 00 01 86 a0
                                 00 01 86 a0 00 00 00 00
                                 00:34:14 : Received packet for session with neighbor 2.2.2.2 on Gi 4/24
                                 RX packet dump:
                                 20 c0 03 18 00 00 00 05 00 00 00 04 00 01 86 a0
                                 00 01 86 a0 00 00 00 00
                                 00:34:14 : Sent packet for session with neighbor 2.2.2.2 on Gi 4/24
                                 TX packet dump:
The output for the debug bfd event command is the same as the log messages that appear on the console by default.

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