Bidirectional Forwarding Detection (BFD) | 149
Delete session on Down: False
Client Registered: CLI
Uptime: 00:09:06
Statistics:
Number of packets received from neighbor: 4092
Number of packets sent to neighbor: 4093
Number of state changes: 1
Number of messages from IFA about port state change: 0
Number of messages communicated b/w Manager and Agent: 7
Disabling and re-enabling BFD
BFD is enabled on all interfaces by default, though sessions are not created unless explicitly configured. If
BFD is disabled, all of the sessions on that interface are placed in an Administratively Down state
(Message 2), and the remote systems are notified of the session state change (Message 3).
To disable BFD on an interface:
To re-enable BFD on an interface:
Configuring BFD for Static Routes
Configuring BFD for Static Routes is supported on C-Series and E-Series only.
BFD gives systems a link state detection mechanism for static routes. With BFD, systems are notified to
remove static routes from the routing table as soon as the link state change occurs, rather than having to
wait until packets fail to reach their next hop.
Step Task Command Syntax Command Mode
1 Disable BFD on an interface. no bfd enable INTERFACE
Message 2 Disabling BFD on a Local Interface
R1(conf-if-gi-4/24)#01:00:52: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session state to Ad
Dn for neighbor 2.2.2.2 on interface Gi 4/24 (diag: 0)
Message 3 Remote System State Change due to Local State Admin Down
R2>01:32:53: %RPM0-P:RP2 %BFDMGR-1-BFD_STATE_CHANGE: Changed session state to Down for neighbor
2.2.2.1 on interface Gi 2/1 (diag: 7)
Step Task Command Syntax Command Mode
1 Enable BFD on an interface. bfd enable INTERFACE
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