Concept Guide

INTERFACE mode
bfd enable
If you disable BFD on a local interface, this message displays:
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)
If the remote system state changes due to the local state administration being down, this message displays:
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)
Congure BFD for Static Routes
BFD oers systems a link state detection mechanism for static routes.
With BFD, systems are notied to remove static routes from the routing table as soon as the link state change occurs, rather than waiting
until packets fail to reach their next hop.
Conguring BFD for static routes is a three-step process:
1 Enable BFD globally. Refer to Enabling BFD Globally.
2 On the local system, establish a session with the next hop of a static route. Refer to Establishing Sessions for Static Routes.
Related Conguration Tasks
• Changing Static Route Session Parameters
• Disabling BFD for Static Routes
Establishing Sessions for Static Routes
Sessions are established for all neighbors that are the next hop of a static route.
Figure 11. Establishing Sessions for Static Routes
To establish a BFD session, use the following command.
• Establish BFD sessions for all neighbors that are the next hop of a static route.
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Bidirectional Forwarding Detection (BFD)