Re: [OSPF] draft-ietf-ospf-ospfv3-graceful-restart-03

Hi Vivek,

Ok - if I explain the problem in section 2.3 as I did below (only more
elegantly :^), will that eliminate your concern? Since, heretofore, this 
is are
only WG Last Call comment, I'm compelled to address it.

Thanks,
Acee

Vivek Dubey wrote:

>Acee,
>I agree/understand the, reasons to keep Interface-Id same across restarts.
>But the current phrasing seems to imply that reason for preserving Interface-Id is to keep "the pre-restart and post-restart LSAs same".
>
>The phrasing used in explanation below is more clear.
>
>Thanks
>Vivek
>
>
>On Wed, 03 May 2006 Acee Lindem wrote :
>  
>
>>Vivek,
>>
>>Vivek Dubey wrote:
>>
>>    
>>
>>>Section 3.2:
>>>If this were not the case, the pre-restart and post-restart LSAs wouldn't be the same and the restart would be disruptive.
>>>
>>><vivek> If "post-restart" here means "after router undergoing restart has exited/exiting graceful-restart", it is supposed to reoriginate LSAs as per Section 2.3 RFC 3623. Description in Section 2.3 RFC 3623 does not mandate the contents to be same. Than why do pre-restart and post-restart LSAs need to be same?
>>>
>>>Preservation of Interface IDs have more to do with figuring out whether restarting router has re-established all its adjacencies.
>>> 
>>>      
>>>
>>Since the interface ID is in the link data for OSPFv3 router LSAs, a change in interface ID
>>could result in a mismatch between neighbor adjacency state for the restarting router and
>>the pre-restart router LSA. Synchronizing the change across the restarting router and
>>the helping routers would be very difficult (if not next to impossible) and would probably
>>result in unreachability or premature graceful restart termination. It is much better for the
>>restarting router to preserve this state across restarts.
>>
>>Hope this helps,
>>Acee
>>
>>    
>>
>>>-Vivek
>>>
>>>
>>> 
>>> 
>>>------------------------------------------------------------------------
>>>
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>>>OSPF@ietf.org
>>>https://www1.ietf.org/mailman/listinfo/ospf
>>> 
>>>      
>>>
>
>  
>

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