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

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: 2010年6月30日 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

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Han Li, Ph.D
China Mobile Research Institute
Unit 2, 28 Xuanwumenxi Ave, Xuanwu District, Beijing 100053, China
Fax: +86 10 63601087
MOBILE: 13501093385
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