The
revert-time command has no effect on the unconditional select mode. Traffic is unconditionally switched to the user-selected path and stays on it.
The path stability test used with the Revert Timer feature is based on the uptime of the latest instance of the path. This value can be different when the selected path has gone through a "make-before-break" procedure.
For an LSP going through re-optimization, the new LSP does not carry traffic until the revert timer expires.
When a user changes the revert timer, the basis of counting is the uptime of the path and is independent of the sequence or combination of configurations. Take, for example, a path that is configured in the manual select mode to be a secondary path with a revert-timer of 10 seconds. After the secondary path comes up, a 10-second timer starts, but after five seconds, the user changes the revert-timer value to four. Now the path has already been stable beyond the new configured revert-timer, so the original timer is canceled and traffic immediately switches over. However, if the user were to change the revert-timer value to eight seconds after running for five seconds, the existing count would terminate and start a new count of three seconds from the moment the first count terminated.
