This read-write INTEGER selects the preemption mechanism for a Flex Links interface pair: off means the active interface never yields back to a recovered link, forced means the active interface always preempts the backup after the delay in eltexFlIfConfigPreemptionDelay, and bandwidth means the higher-bandwidth interface always becomes active. An admin picks this to control failback behavior after the primary link recovers. For example, setting it to forced ensures the original primary interface reclaims active status once it comes back up, after the configured delay.