Re: [mpls] Retiring ACH TLVs

[Nitin Bahadur <[e-mail]>]

Fully support the ID. I was never a fan of ACH TLVs.

Thanks
Nitin Bahadur





On 5/7/13 10:08 AM, "Adrian Farrel" <[e-mail]> 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: [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-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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