Using LSP BFD for LSP Path Protection

SR OS can determine the forwarding state of an LSP from the LSP BFD session, allowing users of the LSP to determine whether their transport is operational. If BFD is down on an LSP path, then the path is considered to be BFD degraded by the system.

Using the failure-action command, a user can configure the action taken by the system if BFD fails for an RSVP LSP or LDP prefix list. There are three possible failure actions:

In all cases, an SNMP trap is raised indicating that BFD has gone down on the LSP.

Note:

It is recommended that BFD control packet timers are configured to a value that is large enough to allow for transient data path disruptions that may occur when the underlying transport network recovers following a failure.