Retiring TLVs from the Associated Channel Header of the MPLS Generic Associated Channel

Document Type Replaced Internet-Draft (individual)
Authors Adrian Farrel  , Stewart Bryant 
Last updated 2013-06-10 (latest revision 2013-05-23)
Replaced by RFC 7026, RFC 7026
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IESG IESG state Replaced by draft-ietf-mpls-retire-ach-tlv, draft-ietf-mpls-retire-ach-tlv
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


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 TLV constructs that can be carried in messages on the G-ACh by placing them in the ACH between the fixed header fields and the G-ACh message. These TLVs are called ACH TLVs No Associated Channel Type yet defined uses an ACH 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.


Adrian Farrel (
Stewart Bryant (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)