This read-create value, in seconds, sets the minimum spacing between Level 2 Partial Sequence Number PDUs this router sends on the circuit to request or acknowledge missing backbone LSPs. It provides the same pacing control as the Level 1 version but scoped to Level 2 adjacencies on core links. An administrator tuning a busy backbone point-to-point circuit might lower csIsisCircL2PartSNPInterval to make the router request missing L2 LSPs more promptly after a database mismatch.