[mpls-tp] 答复: [PWE3] Proposal of using GAL for PW

Hi, 

The CW on many applications is also option in our network. 

Thanks, 
Pei

-----邮件原件-----
发件人: mpls-tp-bounces@ietf.org [mailto:mpls-tp-bounces@ietf.org] 代表 ruiquan.jing@ties.itu.int
发送时间: 2010年7月1日 15:46
收件人: hejia@huawei.com; amalis@gmail.com
抄送: lihan@chinamobile.com; pwe3@ietf.org; mpls-tp@ietf.org
主题: Re: [mpls-tp] [PWE3] Proposal of using GAL for PW

Hi all,

I agree with Jia and Luca. As CW is defined as OPTIONAL, there are many 
applications of PW without CW in our network.
So I support the Proposal of using GAL for PW OAM.

Best regards 

Ruiquan Jing 

China¡¡Telecom  Beijing  Research¡¡Institute

> -----Original Message-----
> From: mpls-tp-bounces@ietf.org 
> [mailto:mpls-tp-bounces@ietf.org] On Behalf Of Jia HE
> Sent: Thursday, July 01, 2010 1:31 PM
> To: Andrew G. Malis
> Cc: lihan@chinamobile.com; pwe3@ietf.org; HUANG Feng F; 
> mpls-tp@ietf.org
> Subject: Re: [mpls-tp] [PWE3] Proposal of using GAL for PW
> 
> Hi Andy,
> 
> The problem is there do exist applications of PW without CW 
> in the network. By adding GAL for PW OAM it dosen't impact 
> the services on the wire and will align the OAM process for 
> both LSP and PW in MPLS-TP environment.
> 
> Since MPLS-TP covers both LSP and PW, it is better to 
> consider them together for easy implementations.
> 
>  
> 
> B.R.
> Jia
> 
> 
> ----- Original Message -----
> From: "Andrew G. Malis" <amalis@gmail.com>
> To: "HUANG Feng F" <Feng.f.Huang@alcatel-sbell.com.cn>cn>; 
> "Larry" <larryli888@yahoo.com.cn>
> Cc: <lihan@chinamobile.com>om>; <pwe3@ietf.org>rg>; <mpls-tp@ietf.org>
> Sent: Thursday, July 01, 2010 12:27 AM
> Subject: Re: [PWE3] Proposal of using GAL for PW
> 
> 
> > Larry and Feng,
> > 
> > This issue has previously been discussed at length by the working
> > group, both at the Anaheim meeting and by email, for 
> example in emails
> > with the subject line "Possible Contradiction re use of GAL in
> > pwe3-static-pw-status". There was rough consensus that for MPLS-TP
> > applications and/or when PW OAM is desired, PW implementations are
> > mature enough (it has been 10 years now, after all) that 
> the time has
> > come to require the implementation of the CW for all PWs, including
> > Ethernet.
> > 
> > Cheers,
> > Andy
> > 
> > On Wed, Jun 30, 2010 at 6:34 AM, HUANG Feng F
> > <Feng.f.Huang@alcatel-sbell.com.cn> wrote:
> >>
> >> it is reasonable to support GAL in MPLS-TP PW OAM, it is 
> more generic, because CW is an option RFC4448 for Ethernet over MPLS.
> >>
> >> 4.6.  The Control Word
> >>
> >> xxxx
> >>
> >>
> >> The features that the control word provides may not be needed for a
> >>   given Ethernet PW.  For example, ECMP may not be present 
> or active on
> >>   a given MPLS network, strict frame sequencing may not be 
> required,
> >>   etc.  If this is the case, the control word provides 
> little value and
> >>   is therefore optional.  Early Ethernet PW 
> implementations have been
> >>   deployed that do not include a control word or the 
> ability to process
> >>   one if present.  To aid in backwards compatibility, future
> >>   implementations MUST be able to send and receive frames 
> without the
> >>   control word present.
> >> xxxx
> >>
> >>
> >>
> >> B.R.
> >> Feng Huang
> >>
> >>
> >> -----Original Message-----
> >> From: pwe3-bounces@ietf.org [mailto:pwe3-bounces@ietf.org] 
> On Behalf Of Larry
> >> Sent: 2010Äê6ÔÂ30ÈÕ 17:38
> >> To: mpls-tp@ietf.org; pwe3@ietf.org
> >> Cc: lihan@chinamobile.com
> >> Subject: [PWE3] Proposal of using GAL for PW
> >>
> >> Dear all:
> >>
> >>     In section 4.2 in RFC5586, it is defined that GAL MUST 
> NOT be used with PWs in MPLS-TP. The PWE3 control word 
> [RFC4385] MUST be present when the ACH is used to realize the 
> associated control channel.
> >>     In real application, a lot of MPLS and MPLS-TP 
> equipments do not support control word. It is proposed to use 
> the GAL to identify associated control channel in PW layer.
> >>
> >> Best regards,
> >>
> >>                 Han Li
> >>
> >> 
> ********************************************************************
> >> Han Li, Ph.D
> >> China Mobile Research Institute
> >> Unit 2, 28 Xuanwumenxi Ave, Xuanwu District, Beijing 100053, China
> >> Fax: +86 10 63601087
> >> MOBILE: 13501093385
> >> 
> ********************************************************************
> >>
> > _______________________________________________
> > pwe3 mailing list
> > pwe3@ietf.org
> > https://www.ietf.org/mailman/listinfo/pwe3
> >
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