Re: [mpls] Retiring ACH TLVs

[David Allan I <[e-mail]>]

I'm all for deprecating ACH TLVs. 

Support 
Dave 

>>> 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: [e-mail] [mailto:[e-mail]]
>>>> 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-0
>>>> 0
>>>> 
>>>> 
>>>> 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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