This object sets the maximum period, in milliseconds, between Level 2 IIH PDUs on multiaccess networks, the Level 2 counterpart to csIsisCircL1HelloTimer, following resettingTimer behavior. Administrators tune this the same way as the Level 1 Hello timer but for backbone-facing adjacencies, balancing faster failure detection against Hello traffic overhead. For example, an engineer lengthens csIsisCircL2HelloTimer on a low-bandwidth backbone circuit to reduce Hello PDU overhead, accepting a slightly slower Level 2 neighbor-down detection time.