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List:       ms-ospf
Subject:    Re: AppendixE clarification
From:       Alex Zinin <azinin () NEXSI ! COM>
Date:       2001-11-28 22:13:21
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Alex,

 When "preempting" the LSA for a different prefix,
 you need to perform all normal actions done when
 an LSA is reoriginated, i.e., bump the SeqNum,
 reset the Age, fill the new contents, and flood.

 In your scenario, when you decide to preempt
 the LSA, the new SeqNum and reset Age will result
 in correct announcement of the new prefix which
 will implicitly withdraw the one being flushed.
 Then your code would probably try to reassign this
 old prefix to a new LSA. At that moment, the LSA
 origination code should be smart enough to understand
 that the new announcement is not necessary since
 the prefix is being deleted from the domain and
 no LSA should be originated.                  l

--
Alex Zinin

Friday, November 23, 2001, 7:09:11 AM, alex lerin wrote:

> Hi,

>  I had this little problem with Appendix E. Appendix E
> states that if the network mask for the new
> destination longer then that of the old LSAs
> destination then the old LSA should be originated for
> the new destination and the new LSA for the old
> destination with the host bits set. Does this also
> apply if my old database copy is MaxAge and is waiting
> to be deleted from the database. In this case if I
> swap the destinations (while not swapping the ages)
> then the LSA for the new destination gets deleted
> after receiving acknowledgements.

>   The two solutions I can think of is I can go ahead
> and ignore the database copy (ie. not apply appendix
> E, and overwrite the new LSA over the old one) and
> originate the new LSA for the new destination. Or I
> can swap the ages of the two LSAs too. I wanted to
> know if I am on the right track. If anyone has a
> better idea, please share it with me.

> Regards
> Alex



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