Re: [mpls] R: PSC: draft-rhd-mpls-tp-psc-priority-00

[Huub van Helvoort <[e-mail]>]

Yaacov, hi,

You replied:

> Not sure how consistent your answers are in this email.
> 
> You believe that the priority swap should be instituted "to provide 
> consistent behavior", Yet you say that the change should be made to 
> RFC6378, which would make the behavior inconsistent with RFC4427.

As explained in liaison http://datatracker.ietf.org/liaison/1234/
we would like consistency with other transport network linear
protection mechanisms.

> So do we want to be consistent or inconsistent?

If you want consistency between linear protection (using data plane
protocols) and linear restoration (using control plane protocols) you
should consider changing RFC4427 too.

Regards, Huub.


> On Wed, May 8, 2013 at 10:22 PM, Huub van Helvoort <[e-mail] 
> <mailto:[e-mail]>> wrote:
> 
>     Hi,
> 
> 
>         Hi Eric,
>         You wrote "is it appropriate to make this priority swap?"
>         My answer is yes, it shall be done for the reasons explained in
>         liaison 1205, bullet 1.
> 
> 
>     It should be mandatory to swap to provide consistent behaviour.
> 
> 
>         You wrote "- what do we need to change?  rfc5654?  rfc4427?  "
>         No I don't believe it is required to change any RFC but RFC 6378
> 
> 
>     Indeed RFC6378 should be fixed.
> 
>     Regards, Huub.
> 
> 
> 
>         -----Messaggio originale-----
>         Da: [e-mail] <mailto:[e-mail]>
>         [mailto:[e-mail] <mailto:[e-mail]>]
>         Per conto di Eric Osborne (eosborne)
>         Inviato: mercoledì 17 aprile 2013 14:16
>         A: [e-mail] <mailto:[e-mail]>
>         Oggetto: [mpls] PSC: draft-rhd-mpls-tp-psc-__priority-00
> 
>         This thread is for discussing
>         draft-rhd-mpls-tp-psc-__priority-00.  In brief, the draft
>         proposes swapping the priorities between FS and SF-P (see
>         section 4.3.2 of rfc6378).  This proposed swap has a long
>         history, dating back to when PSC was an ID.  For some history, see
> 
>         http://datatracker.ietf.org/__liaison/1229/
>         <http://datatracker.ietf.org/liaison/1229/>
>         and
>         http://datatracker.ietf.org/__liaison/1234/
>         <http://datatracker.ietf.org/liaison/1234/>
> 
>         The questions that I think are relevant here are:
> 
>         - is it appropriate to make this priority swap?
>             - are there alternative approaches?
>             - what do we need to change?  rfc5654?  rfc4427?
>         - if we don't make the change, does this expose implementation
>         to problems?
>         - if we do make the change, how do we go about it?
> 
>         but of course any and all discussion is welcome.
> 
>         As with the other threads I'm going to leave my two cents out of
>         this introductory email but I'll chime in when discussion starts.
> 
> 
> 
> 
> 
>         eric
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> 
> 
> 
> -- 
> Thanx and BR,
> yaacov
> 
> /Still looking for new opportunity/


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