This read-create value, in seconds, sets the minimum spacing between Level 1 Partial Sequence Number PDUs this router sends on the circuit, which are used to request specific missing LSPs or acknowledge point-to-point LSPs. Keeping this interval from being too small prevents a burst of PSNP requests from flooding a link when many LSPs are outstanding at once. For example, an engineer debugging a point-to-point serial link that keeps re-requesting the same Level 1 LSP might increase csIsisCircL1PartSNPInterval from its default toward 60 seconds to reduce PSNP chatter.