[PWE3] Tandem Connection Monitoring in the new PWE3 Chapter (was: draft-mohan-pwe3-mpls-eth-oam-iwk-00.txt as WG draft)

[Alexander Vainshtein <Alexander.Vainshtein at ecitele.com>]

 Stewart, Danny and all,

> -----Original Message-----
> From: pwe3-bounces at ietf.org [mailto:pwe3-bounces at ietf.org]
> On Behalf Of neil.2.harrison at bt.com
> Sent: Wednesday, July 09, 2008 10:18 PM
> To: mohand at nortel.com; sajassi at cisco.com
> Cc: pwe3 at ietf.org; stbryant at 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
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