Re: draft-ietf-ospf-graceful-impl-report-00.txt

[Acee Lindem <[e-mail]>]

Acee Lindem wrote:

> Oliver Carter wrote:
>
>> Acee,
>>
>> Thanks for publishing this draft.  I have a question about section
>> 2.1 3rd
>> Para of it.
>>
>> <SNIP>
>> The final difference was in whether or not additional extensions were
>> implemented to accommodate other features such as protocol
>> redistribution or
>> interaction with MPLS VPNs [VPN]. Two vendors implemented extensions and
>> three did not. It should be noted that such extensions are beyond the
>> scope
>> of Graceful OSPF Restart [GRACE].
>> </SNIP>
>>
>> Do you know what additional extensions were implemented?  What are the
>> issues with running Graceful OSPF restart in an MPLS VPN scenario?
>>
> Yes - additional delays need to be added before purging stale LSAs after
> restart. In essence, you have
> to wait until your BGP has converged to assure you've received all your
> VPN routes.

Note that the reason this is needed is that BGP has been restarted as
well (as would
be the case in many redundant control processor implementations).

Thanks,
Acee

>
>
>>
>> Regards
>>
>> Oli
>>
>> P.S. I couldn't find anything related to this on the OSPF or L3VPN
>> mailing
>> lists - feel free to point me at previous posts if this has been
>> discussed
>> before.
>>
>>
>>
>>
>