This is the RSVP-TE K value, the number of consecutive missed path or RESV refresh messages that must occur, spaced by the refresh interval, before a session's state is considered timed out. Together with the refresh interval, this value determines the total time before a stale reservation is torn down; setting K too low risks tearing down a session during a brief transient delay, while setting it too high leaves a genuinely dead session's resources reserved for longer than necessary. For example, a K value of 3 combined with a 30-second refresh interval means the session tolerates missing up to 2 refreshes but tears down after the 3rd consecutive miss, roughly 90 seconds of silence.