michael,

  See http://discuss.microsoft.com/SCRIPTS/WA-MSD.EXE?A2=ind9911&L=OSPF&P=R5168
  in particular and the discussion at the following URL:

  http://discuss.microsoft.com/SCRIPTS/WA-MSD.EXE?A1=ind9912&L=ospf#14

--
Alex Zinin
Monday, July 09, 2001, 7:34:33 AM, michael Jones wrote:
> Hello
> section 13.1 describe which LSA is newer
> 1- The LSA having the newer LS sequence number is more
> recent.See Section 12.1.6 for an explanation of the LS
> sequencenumber space.  If both instances have the same
> LS sequencenumber, then:
> 2- If the two instances have different LS checksums,
> then the instance having the larger LS checksum (when
> considered as a 16-bit unsigned integer) is considered
> more recent.
> 3- Else, if only one of the instances has its LS age
> field set to MaxAge, the instance of age MaxAge is
> considered to be more recent.
> 4-Else, if the LS age fields of the two instances
> differ by more than MaxAgeDiff, the instance having
> the smaller (younger) LS age is considered to be more
> recent.
> 5- Else, the two instances are considered to be
> identical.
> =========================
> I )
> when 2) could be true ( same instance and different
> checksum ) and why in this case the larger checksum is
> considered as newer
> II)
> when 4) could be true ( same instance and age differ
> by more than MaxageDiff = 15 min ) and why in this
> case only when the age differ more than this value,
> the smaller age is considered as more recent
> regards.
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