If that "should" is a formal SHOULD then I would say yes, it's an update,
but that needs to be mentioned very explicitly ("This is a change to the
requirements of Section X of RFC Y" or something like that.) That way an
implementer is left in no doubt.

Just IMHO, of course.

Regards
   Brian

On 16/10/2015 03:49, Jeffrey (Zhaohui) Zhang wrote:
> Brian, Jari, all,
> 
> Some information on whether it should be update or extension:
> 
> For the particular use case - supporting MVPN C-Bidir (Customer Bidirectional 
> PIM) with Ingress Replication - the optimized procedures in this new 
> specification should be used on all PEs for the involved VPN. The old 
> procedures can still be used (but not mixed) even for this use case but they 
> involve much more signaling. 
> 
> I am not sure if this constitutes "update" or just an extension and I 
> appreciate your input.
> 
> Thanks.
> Jeffrey
> 
>> -----Original Message-----
>> From: Jari Arkko [mailto:[email protected]]
>> Sent: Wednesday, October 14, 2015 7:40 PM
>> To: Brian E Carpenter <[email protected]>; draft-ietf-bess-mvpn-
>> [email protected]
>> Cc: General Area Review Team <[email protected]>
>> Subject: Re: [Gen-art] Gen-ART telechat review of draft-ietf-bess-mvpn-
>> bidir-ingress-replication-03
>>
>> Thanks for your review(s), Brian! Much appreciated. Re: the update
>> question. Good question. What say the rest of you?
>>
>> Jari
> 
> 

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