Re: [mpls-tp] [mpls] WG LC draft-lm-pwe3-mpls-tp-gal-in-pw-00.txt
Alexander Vainshtein <Alexander.Vainshtein@ecitele.com> Fri, 11 March 2011 19:20 UTC
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: Greg Mirsky <gregimirsky@gmail.com>, Luca Martini <lmartini@cisco.com>
Date: Fri, 11 Mar 2011 21:21:49 +0200
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Cc: "lihan@chinamobile.com" <lihan@chinamobile.com>, "mpls-tp@ietf.org" <mpls-tp@ietf.org>, pwe3 <pwe3@ietf.org>, HUANG Feng F <Feng.f.Huang@alcatel-sbell.com.cn>, "mpls@ietf.org" <mpls@ietf.org>
Subject: Re: [mpls-tp] [mpls] WG LC draft-lm-pwe3-mpls-tp-gal-in-pw-00.txt
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Greg, Luca, As I've already stated in my comment on draft-nadeau-pwe3-vccv-2, IMHO it makes draft-lm-pwe3-mpls-tp-gal-in-pw completely useless. My 2c, Sasha From: mpls-bounces@ietf.org [mailto:mpls-bounces@ietf.org] On Behalf Of Greg Mirsky Sent: Friday, March 11, 2011 9:14 PM To: Luca Martini Cc: lihan@chinamobile.com; mpls@ietf.org; pwe3; HUANG Feng F; mpls-tp@ietf.org Subject: Re: [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<mailto: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> > <mailto: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>> > > <mailto: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>> <mailto: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> <mailto:mpls@ietf.org<mailto:mpls@ietf.org>> > > https://www.ietf.org/mailman/listinfo/mpls > >
- Re: [mpls-tp] [mpls] WG LC draft-lm-pwe3-mpls-tp-… Greg Mirsky
- [mpls-tp] WG LC draft-lm-pwe3-mpls-tp-gal-in-pw-0… Greg Mirsky
- Re: [mpls-tp] WG LC draft-lm-pwe3-mpls-tp-gal-in-… Alexander Vainshtein
- Re: [mpls-tp] WG LC draft-lm-pwe3-mpls-tp-gal-in-… neil.2.harrison
- Re: [mpls-tp] [mpls] WG LC draft-lm-pwe3-mpls-tp-… Luca Martini
- Re: [mpls-tp] [PWE3] WG LC draft-lm-pwe3-mpls-tp-… Shahram Davari
- Re: [mpls-tp] [mpls] WG LC draft-lm-pwe3-mpls-tp-… Luca Martini
- Re: [mpls-tp] [mpls] WG LC draft-lm-pwe3-mpls-tp-… Greg Mirsky
- Re: [mpls-tp] [mpls] WG LC draft-lm-pwe3-mpls-tp-… Alexander Vainshtein
- Re: [mpls-tp] [mpls] WG LC draft-lm-pwe3-mpls-tp-… venkatesan mahalingam
- Re: [mpls-tp] [PWE3] [mpls] WG LC draft-lm-pwe3-m… Thomas Nadeau
- Re: [mpls-tp] [mpls] WG LC draft-lm-pwe3-mpls-tp-… Alexander Vainshtein
- Re: [mpls-tp] [mpls] WG LC draft-lm-pwe3-mpls-tp-… Robert Rennison
- Re: [mpls-tp] [PWE3] [mpls] WG LC draft-lm-pwe3-m… Greg Mirsky
- Re: [mpls-tp] [PWE3] [mpls] WG LC draft-lm-pwe3-m… Alexander Vainshtein
- Re: [mpls-tp] [PWE3] [mpls] WG LC draft-lm-pwe3-m… Greg Mirsky
- Re: [mpls-tp] [PWE3] [mpls] WG LC draft-lm-pwe3-m… Alexander Vainshtein
- Re: [mpls-tp] [PWE3] [mpls] WG LC draft-lm-pwe3-m… Curtis Villamizar
- Re: [mpls-tp] [PWE3] [mpls] WG LC draft-lm-pwe3-m… Alexander Vainshtein
- Re: [mpls-tp] [PWE3] [mpls] WG LC draft-lm-pwe3-m… Curtis Villamizar