This is the minimum interval, in seconds, between re-transmission of an LSP at this level, following the resettingTimer behavior; note that ciiCircLevelLSPThrottle controls how fast we send back-to-back distinct LSPs while this variable controls how fast we re-send the same LSP. On point-to-point circuits IS-IS requires an acknowledgment for each LSP sent, and this timer governs how long the router waits before re-transmitting an unacknowledged LSP, so setting it too short risks needlessly duplicating transmissions onto a slow or high-latency link before the first attempt's acknowledgment could possibly have arrived. For example, on a satellite link with 600ms of round-trip latency, leaving this retransmission interval too low, such as 1 second, could cause the router to re-send an LSP that was already correctly received but whose acknowledgment simply had not made it back yet.