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

[Sami Boutros <[e-mail]>]

Hi Lizhong,

Thanks for your comments. Please see comments inline.
At 04:38 AM 5/5/2011, [e-mail] wrote:

>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.

Sami: Correct it does.

>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.

Sami: We will update this section in next Rev to specify the handling 
and the meaning of 0 counters and to work around cases of wrapping counters.


>    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?

Sami: Agreed as per above.

Thanks,

Sami


>Regards
>Lizhong
>
>
>
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Tue, 03 May 2011 13:42:04 -0700
> > From: Sami Boutros <[e-mail]>
> > To: <[e-mail]>, [e-mail]
> > Cc: "Malis, Andrew G. \(Andy\)" <[e-mail]>,   "Siva
> >    Sivabalan \(msiva\)" <[e-mail]>
> > Subject: [PWE3] draft-boutros-pwe3-mpls-tp-mac-wd-01
> > Message-ID: <[e-mail]>
> > 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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