Re: [PWE3] draft-boutros-pwe3-mpls-tp-mac-wd-01

lizhong.jin@zte.com.cn Thu, 05 May 2011 11:39 UTC

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To: sboutros@cisco.com
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From: lizhong.jin@zte.com.cn
Date: Thu, 05 May 2011 19:38:54 +0800
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Cc: l2vpn@ietf.org, andrew.g.malis@verizon.com, pwe3@ietf.org, msiva@cisco.com
Subject: Re: [PWE3] draft-boutros-pwe3-mpls-tp-mac-wd-01
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Hi Sami,
Does the MAC address withdraw OAM message shares the same Associated 
Channel Type with PW OAM Message? I don't see the IANA assignment for this 
message in the draft. Other comments, see below.

4.1.2. Operation of Receiver

   Each PW is associated with a counter to keep track of the sequence
   number of the MAC withdrawal message received last. Whenever a MAC
   withdrawal message is received, and if the sequence number on the
   message is greater than the receive counter, the MAC address(es)
   contained in the MAC TLV(s) is/are removed, and the receive counter
   is incremented. The receiver sends an ACK whose sequence number is
   the same as the received message.
[Lizhong] "greater than the receive counter" may not be the case, when PE 
receives the first MAC withdrawal message, the receiver counter would be 
empty. When the sequence number overflow, the receiver counter maybe 
greater that the sequence number.

   If the sequence number in the received message is smaller than or
   equal to the receive counter, the MAC TLV(s) is/are not processed.
   However, an ACK whose sequence number is the same as the received
   message is sent.
[Lizhong] It would be better to define the range of valid sequence number, 
e.g, is "0" valid for the sequence number?


Regards
Lizhong



> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Tue, 03 May 2011 13:42:04 -0700
> From: Sami Boutros <sboutros@cisco.com>
> To: <pwe3@ietf.org>, l2vpn@ietf.org
> Cc: "Malis, Andrew G. \(Andy\)" <andrew.g.malis@verizon.com>,   "Siva
>    Sivabalan \(msiva\)" <msiva@cisco.com>
> Subject: [PWE3] draft-boutros-pwe3-mpls-tp-mac-wd-01
> Message-ID: <XFE-SJC-2115U9T3TGJ000000bc@xfe-sjc-211.amer.cisco.com>
> Content-Type: text/plain; charset="us-ascii"; format=flowed
> 
> 
> We have presented "
> MAC Address Withdrawal over Static Pseudowire
> " at IETF79 and 80
> http://tools.ietf.org/html/draft-boutros-pwe3-mpls-tp-mac-wd-01
> 
> 
>     This document specifies a mechanism to signal MAC address withdrawal
>     notification using PW Associated Channel (ACH). Such notification is
>     useful when statically provisioned PWs are deployed in VPLS/H-VPLS
>     environment.
> 
> 
> The authors are seeking more feedback from the mailing list, and 
> would be grateful if you could review the document and post comments 
> on the mailing list.
> 
> Thanks,
> Sami
> 
> 
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Re: [PWE3] draft-boutros-pwe3-mpls-tp-mac-wd-01 lizhong.jin
Re: [PWE3] draft-boutros-pwe3-mpls-tp-mac-wd-01 Sami Boutros