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Link State Acknowledgment packet:

  • LSACK is message type 5 inside OSPF header.
  • As the name suggests it is an acknowledgement sent in return to all the LSA’s received from the neighbor to make it reliable.
  • OSPF needs the acknowledgement of all the LSA that are sent.
  • For each and every LSA, there is LSACK sent, LSACK can contain multiple LSA (just like LSU) acknowledging all the LSA’s received.
  • LSACKs are also synced using Sequence numbers to indicate the latest LSACK which was last received, its incremented by 1.

LSA Header- List of LSA Headers being acknowledged.

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