Is Is Packet Format Sequence


Sequence number PDUs are used to request and acknowledge LSPs during database synchronization.

Sequence Number Protocol Data Unit

  • There are two types of SNPDU: Partial Sequence Numbers PDU (PSNP) and Complete Sequence Number PDU (CSNP).
    • CSNP is used to distribute the complete link-state database of a router.
    • PSNP is used to ACK and request missing LSPs for link state information.


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