Maintaining BFD
After configuring BFD, you can run the display commands to view the configuration result, session information, and related statistics. You can also clear statistics or enable debugging if necessary.
Checking BFD Information
During routine maintenance, you can run the following commands in any view to learn about BFD running status.
You can view the information about BFD session statistics and BFD sessions only after parameters for BFD sessions are specified and BFD sessions are successfully created.
Action |
Command |
|---|---|
Check the configuration of the BFD session. |
display bfd configuration { all | dynamic | peer-ip peer-ip [ vpn-instance vpn-instance-name ] } | peer-ipv6 peer-ipv6 [ vpn-instance ] | static [ name cfg-name ] | static-auto } [ verbose ] |
Check the information about the BFD-enabled interface. |
display bfd interface [ interface-type interface-number ] |
Check the information about the BFD session. |
display bfd session { all | discriminator local-discr-value | dynamic | peer-ip peer-ip [vpn-instance vpn-instance-name ] | static | static-auto } [ verbose ] |
Check global BFD statistics. |
|
Check statistics on BFD sessions. |
display bfd statistics session { all | discriminator local-discr-value | dynamic | peer-ip peer-ip [ vpn-instance vpn-instance-name ] | static | static-auto } |
Check the information about the BFD session triggered by the OSPF neighbor. |
display ospf [ process-id ] bfd session interface-type interface-number [ router-id ] display ospf [ process-id ] bfd session { router-id | all } |
Check the information about the BFD session stored in RM. |
display rm bfd-session [ vpn-instance vpn-instance-name ] [ destination destination-address ] [ source source-address ] [ interface interface-type interface-number ] [ protocol protocol ] |
Clearing BFD Statistics
To diagnose and locate BFD faults, you need to perform DHCP statistics for a period of time to check the consistency between received and sent packets. Therefore, before you restart a statistics operation, run the reset command to clear historical statistics.
BFD statistics cannot be restored after you clear them. Therefore, perform the operation with caution.
Action |
Command |
|---|---|
Clear statistics on received and sent BFD packets. |
reset bfd statistics { all | discriminator discriminator-value } |
Debugging BFD
When a BFD running fault occurs, you can run the debugging commands in the user view to debug BFD, view the debugging information, and locate and analyze the fault.
Before you enable debugging functions, run the terminal monitor and terminal debugging commands in the user view to enable terminal information display and debugging information display on the terminal.
Enabling debugging functions will deteriorate system performance. After debugging processes are complete, run the undo debugging all command in a timely manner to disable the debugging functions.
For the description of debugging commands, refer to the Debugging Reference.
Action |
Command |
|---|---|
Enable all BFD debugging functions. |
debugging bfd all |
Enable the BFD defect detection debugging. |
debugging bfd defect-detect |
Enable the BFD error debugging. |
debugging bfd error |
Enable the BFD event debugging. |
debugging bfd event |
Enable the BFD state machine debugging. |
debugging bfd fsm |
Enable the BFD packet debugging. |
debugging bfd packet |
Enable the BFD process debugging. |
debugging bfd process |
Enable the BFD product interface debugging. |
debugging bfd product-interface |
Enable the BFD session management debugging. |
debugging bfd session-management |
Enable the BFD timer debugging. |
debugging bfd timer |