Re: [mpls] Retiring ACH TLVs

Please, please do this.

thanks,
Pablo

On Tue, May 7, 2013 at 1:08 PM, Adrian Farrel <adrian@olddog.co.uk> wrote:

> Hi,
>
> ACH TLVs keep popping up and causing Stewart and me trouble. Mainly it is
> about explaining why no-one actually wants to use them (i.e., when each new
> ACH Type is defined and has a "No TLVs" written for it, we get asked "why
> not?").
>
> It seems to us that ACH TLVs are an idea that has been rejected. Initially
> we thought they might be used (especially for identifiers), but there seems
> to be good opinion that handling generic TLVs would be a pain.
>
> Since I was heavily responsible for insisting that ACH TLVs were included
> in RFC 5586, it seems reasonable that I do the work to fix it.
>
> The I-D below retires ACH TLVs and handles the necessary registry changes.
>
> Note, of course, that structured data are still possible within individual
> ACHs if the protocol spec for an individual ACH decides to have them.
>
> We're directing this work to the MPLS working group because that is where
> 5586 was written. I have BCC'ed PWE3, L2VPN, and BFD for information.
>
> Thanks for any comments.
>
> As humble WG contributors we would be enthusiastic to see early WG
> adoption and last call :-)
>
> Thanks,
> Adrian
>
> > -----Original Message-----
> > From: internet-drafts@ietf.org [mailto:internet-drafts@ietf.org]
> > Sent: 07 May 2013 17:33
> > To: Adrian Farrel; Stewart Bryant
> > Subject: New Version Notification for
> draft-farbryantrel-mpls-retire-ach-tlv-
> > 00.txt
> >
> >
> > A new version of I-D, draft-farbryantrel-mpls-retire-ach-tlv-00.txt
> > has been successfully submitted by Adrian Farrel and posted to the
> > IETF repository.
> >
> > Filename:      draft-farbryantrel-mpls-retire-ach-tlv
> > Revision:      00
> > Title:                 Retiring TLVs from the Associated Channel Header
> of the MPLS
> > Generic Associated Channel
> > Creation date:         2013-05-07
> > Group:                 Individual Submission
> > Number of pages: 4
> > URL:
> http://www.ietf.org/internet-drafts/draft-farbryantrel-mpls-retire-
> > ach-tlv-00.txt
> > Status:
> http://datatracker.ietf.org/doc/draft-farbryantrel-mpls-retire-ach-tlv
> > Htmlized:
> http://tools.ietf.org/html/draft-farbryantrel-mpls-retire-ach-tlv-00
> >
> >
> > Abstract:
> >    The MPLS Generic Associated Channel (G-ACh) is a generalization of
> >    the applicability of the Pseudowire (PW) Associated Channel Header
> >    (ACH).  RFC 5586 defines the concept of Type-Length-Variable (TLV)
> >    constructs that can be carried in messages on the G-ACh by placing
> >    them in the ACH.
> >
> >    No Associated Channel Type yet defined uses a TLV.  Furthermore, it
> >    is believed that handling TLVs in hardware introduces significant
> >    problems to the fast-path, and since G-ACh messages are intended to
> >    be processed substantially in hardware, the use of TLVs in
> >    undesirable.
> >
> >    This document updates RFC 5586 by retiring ACH TLVs and removing the
> >    associated registry.
> >
> >
> >
> >
> > The IETF Secretariat
>
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