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Re: [PWE3] Tandem Connection Monitoring in the new PWE3 Chapter

Stewart Bryant <stbryant@cisco.com> Thu, 10 July 2008 10:51 UTC

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Date: Thu, 10 Jul 2008 11:51:16 +0100
From: Stewart Bryant <stbryant@cisco.com>
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To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
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Cc: "neil.2.harrison@bt.com" <neil.2.harrison@bt.com>, "pwe3@ietf.org" <pwe3@ietf.org>, Jeremy Brayley <Jeremy.Brayley@ecitele.com>, Danny McPherson <danny@tcb.net>, Alik Shimelmits <Alik.Shimelmits@ecitele.com>
Subject: Re: [PWE3] Tandem Connection Monitoring in the new PWE3 Chapter
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Alexander Vainshtein wrote:
>  Stewart, Danny and all,
>
>   
>> -----Original Message-----
>> From: pwe3-bounces@ietf.org [mailto:pwe3-bounces@ietf.org]
>> On Behalf Of neil.2.harrison@bt.com
>> Sent: Wednesday, July 09, 2008 10:18 PM
>> To: mohand@nortel.com; sajassi@cisco.com
>> Cc: pwe3@ietf.org; stbryant@cisco.com
>> Subject: Re: [PWE3] draft-mohan-pwe3-mpls-eth-oam-iwk-00.txt
>> as WG draft
>>
>>     
> ... snipped ...
>   
>> I've just noticed TCM (Tandem Connection Monitoring) has been added to the
>> PWE3 charter.  I would strongly advise IETF *not* to go here just
>> because others have included this in their standards.  This idea has
>> been around for many years in ITU and there are very good reasons why
>> very little of it is used in practice (I can spell this out if not
>> obvious).
>>
>> Regards, Neil
>>
>>     
> ... snipped to the end...
>
> I wonder how Tandem Connection Monitoring for PWs has made its way into the published Charter
> as one of the milestones. It is not discussed/defined in the Charter itself and it has not been mentioned
> on the WG mailing list for the last 7+ months (including the versions of the Charter posted for the WG
> discussion during the re-chartering process).
>
> I share Neil's concerns about this topic. In particular, Low-Order Path TCM (defined by ITU-T in addition to the
> SONET High-Order Path TCM) is a feature known both for implementation complexity and lack of actual
> deployments... Do we really need more of the same in PWE3?
>
> Regards,
>         Sasha
>
>
>   
Sasha

TCM for PWs is in the JWT report: draft-bryant-mpls-tp-jwt-report-00.pdf

It was added when we were asked to flesh out deliverables to support 
MPLS-TP.

If as you and Neil suggest it's hard to make work, then that will be 
clear if/when
we see drafts defining it, and we can proceed accordingly.

- Stewart



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