Re: [mpls-tp] [mpls] WG LC draft-lm-pwe3-mpls-tp-gal-in-pw-00.txt

Dear Luca,
thank you for bringing draft-nadeau-pwe3-vccv-2-01 to my attention. I'll
send my comments to it in a separate e-mail.
I'll have to miss another opportunity to discuss your proposal in a meeting.
Please add my comments below to my earlier expressed WG LC comments:

   - the draft-lm-pwe3-mpls-tp-gal-in-pw-00 depends on any solution that
   addresses applicability of GAL in PW VCCV, e.g. solution proposed in
   draft-nadeau-pwe3-vccv-2-01;
   - the draft-lm-pwe3-mpls-tp-gal-in-pw-00 needs to mention such dependency
   and refer to any existing proposal;
   - I believe that the draft-lm-pwe3-mpls-tp-gal-in-pw-00 can be advanced
   in lock with document that addresses use of GAL in PW VCCV.

Regards,
Greg

On Fri, Mar 11, 2011 at 5:31 AM, Luca Martini <lmartini@cisco.com> wrote:

> Greg ,
> Some
>
> On 02/18/11 11:15, Greg Mirsky wrote:
> > Dear Luca,
> > I see at least two issues:
> >
> >     * use of GAL for PW, in my view, is another VCCV CC type that has
> >       to be negotiated as described in RFC 5085.
> >
> These are valid points, but this document in question does not define,
> not discussed VCCV.
> We have since posted a draft that proposes a new VCCV mode , and we
> welcome comments regarding that document.
> (draft-nadeau-pwe3-vccv-2-01.txt)
>
> >     * use of GAL creates ambiguous situation when PW CW is used. The
> >       benefit from extending GAL in PW, as I see, is for PWs that are
> >       not required to use PW CW. That might be a good enough reason to
> >       update RFC 5586 as proposed in the document but we must address
> >       use cases of GAL in PWs that require presence PW CW. If we
> >       prohibit or even discourage use of GAL for these PWs that have
> >       PW VCCV as native Associated Channel, then architecture of ACh
> >       for MPLS-TP PW not simplified as result of adopting the proposal.
> >
> > Regard
> Greg,
> The GAL is basically a notifier that the packet following the end of the
> MPLS label stack, is explicitly defined as a G-ACH format.
> Normally the packet would be decoded as an IP packet , unless the last
> label on the stack indicated otherwise.
>
> The GAL can certainly be applied  to a PW OAM packet on a PW that uses
> the CW, and this document does not define that , nor restricts it.
>
> The scope of this document is limited to removing an unnecessary
> restriction in rfc5586, hence  this comment not applicable to this
> document.
>
> Thanks.
> Luca
>
> > s,
> > Greg
> >
> > On Fri, Feb 18, 2011 at 7:46 AM, Luca Martini <lmartini@cisco.com
> > <mailto:lmartini@cisco.com>> wrote:
> >
> >     Greg,
> >
> >     Sorry, but I do not remember the point you mention.
> >     Can you explain again here ?
> >     Thanks.
> >     Luca
> >
> >
> >     On 02/17/11 23:47, Greg Mirsky wrote:
> >     > Dear Authors and All,
> >     > prior to the meeting in Bejing and acceptance of this proposal as
> WG
> >     > document Luca and I agreed that use of GAL with PW VCCV presents a
> >     > problem.
> >     > I was not attending the IETF-79, nor I found discussion of this
> >     issue
> >     > in the minutes. I think that this issue should be specified,
> >     > explained. In my view, this document updates not only RFC 5586
> >     > but RFC 5085 too.
> >     >
> >     > Regards,
> >     > Greg
> >     >
> >     > Comment to draft-lm-pwe3-mpls-tp-gal-in-pw-00.txt
> >     >
> >     > On Sat, Oct 30, 2010 at 10:14 AM, Luca Martini
> >     <lmartini@cisco.com <mailto:lmartini@cisco.com>
> >     > <mailto:lmartini@cisco.com <mailto:lmartini@cisco.com>>> wrote:
> >     >
> >     >     Greg,
> >     >
> >     >     You are correct , the proposed update does not propose any
> >     changes
> >     >     to VCCV.
> >     >     However the problem with vccv is not as simple as to ask for
> >     a new
> >     >     code point from IANA.
> >     >     Given the good amount of discussion on this point, we should
> >     >     probably have a discussion in Beijing.
> >     >
> >     >     Luca
> >     >
> >     >
> >     >
> >     >     On 10/29/2010 05:07 PM, Greg Mirsky wrote:
> >     >>     Dear Authors,
> >     >>     I think that proposed update of the Section 4.2. RFC 5586
> >     makes it possible
> >     >>     to use GAL on MPLS-TP PW that uses Control Word. I consider
> >     it to be
> >     >>     conflict between PW VCCV CC types because use of GAL is not
> >     negotiated
> >     >>     through PW VCCV negotiation. To avoid such situation I
> propose:
> >     >>
> >     >>        - in Section 5 request IANA to assign new CC Type "MPLS
> >     Generic
> >     >>        Associated Channel Label"
> >     >>        - assign precedence to new CC Type that affects Section
> >     7 RFC 5085
> >     >>
> >     >>     Regards,
> >     >>     Greg
> >     >>
> >     >>
> >     >>
> >     >>     _______________________________________________
> >     >>     mpls mailing list
> >     >>     mpls@ietf.org <mailto:mpls@ietf.org> <mailto:mpls@ietf.org
> >     <mailto:mpls@ietf.org>>
> >     >>     https://www.ietf.org/mailman/listinfo/mpls
> >     >
> >     >
> >     >
> >     > _______________________________________________
> >     > mpls mailing list
> >     > mpls@ietf.org <mailto:mpls@ietf.org>
> >     > https://www.ietf.org/mailman/listinfo/mpls
> >
> >
>
>
>