OSPF – Decision making when multiple instances of same LSA is received

1. Compare the sequence numbers. The LSA with the highest sequence number is more recent.
2. If the sequence numbers are equal, then compare the checksums. The LSA with the highest
unsigned checksum is the more recent.
3. If the checksums are equal, then compare the age. If only one of the LSAs has an age of MaxAge
(3600 seconds), it is considered the more recent. Else:
4. If the ages of the LSAs differ by more than 15 minutes (known as MaxAgeDiff), the LSA with the
lower age is more recent.
5. If none of the preceding conditions are met, the two LSAs are considered identical.

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