This read-write value, in milliseconds, sets how long the switch waits before dropping frames left undelivered on a link that has gone down, so that those frames can instead be retransmitted over an alternate link if one becomes available. An administrator tunes this to control how quickly the switch gives up on a failed link's in-flight frames versus waiting for possible link recovery. For example, lowering fcSwitchDropLatency makes the switch reroute pending frames to a backup path faster after a link failure, at the cost of less patience for a link that might recover quickly.