Using the Generic Associated Channel Label for Pseudowire in the MPLS Transport Profile (MPLS-TP)
RFC 6423
| Document | Type |
RFC - Proposed Standard
(November 2011; No errata)
Updates RFC 5586
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Replaces | draft-lm-pwe3-mpls-tp-gal-in-pw | ||
| Stream | IETF | ||
| Formats | plain text pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Matthew Bocci | ||
| Shepherd write-up | Show (last changed 2011-08-05) | ||
| IESG | IESG state | RFC 6423 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Stewart Bryant | ||
| IESG note | Matthew Bocci (matthew.bocci@alcatel-lucent.com) is the document shepherd. | ||
| Send notices to | (None) | ||
Internet Engineering Task Force (IETF) H. Li
Request for Comments: 6423 China Mobile
Updates: 5586 L. Martini
Category: Standards Track Cisco System
ISSN: 2070-1721 J. He
Huawei
F. Huang
Alcatel-Lucent
November 2011
Using the Generic Associated Channel Label for Pseudowire in
the MPLS Transport Profile (MPLS-TP)
Abstract
This document describes the requirements for using the Generic
Associated Channel Label (GAL) in pseudowires (PWs) in MPLS Transport
Profile (MPLS-TP) networks, and provides an update to the description
of GAL usage in RFC 5586 by removing the restriction that is imposed
on using GAL for PWs, especially in MPLS-TP environments.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6423.
Li, et al. Standards Track [Page 1]
RFC 6423 Using GAL in MPLS-TP PW November 2011
Copyright Notice
Copyright (c) 2011 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction ....................................................2
2. Conventions Used in This Document ...............................2
2.1. Terminology ................................................3
3. GAL Usage for MPLS-TP PW ........................................3
4. Security Considerations .........................................4
5. Acknowledgments .................................................4
6. References ......................................................5
6.1. Normative References .......................................5
6.2. Informative References .....................................5
1. Introduction
[RFC5586] generalizes the Associated Channel mechanism of [RFC5085]
to be used for Sections, Label Switched Paths (LSPs), and Pseudowires
(PWs) in MPLS networks. [RFC5085] defines the Associated Channel
Header (ACH), and [RFC5586] generalizes this for use as the Generic
Associated Channel (G-ACh).
[RFC5586] defines a generalized label-based exception mechanism using
the Generic Associated Channel Label (GAL) to work together with the
ACH for use with LSPs but prohibits GAL usage with PWs.
This document removes the restriction imposed by [RFC5586].
2. Conventions Used in This Document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
Li, et al. Standards Track [Page 2]
RFC 6423 Using GAL in MPLS-TP PW November 2011
2.1. Terminology
ACH Associated Channel Header
CW Control Word
G-ACh Generic Associated Channel
GAL Generic Associated Channel Label
MPLS-TP MPLS Transport Profile
OAM Operation, Administration, and Maintenance
3. GAL Usage for MPLS-TP PW
According to the MPLS-TP requirements document [RFC5654], it is
necessary that MPLS-TP mechanisms and capabilities be able to
interoperate with the existing IETF MPLS [RFC3031] and IETF PWE3
[RFC3985] architectures as appropriate. [RFC5586] differentiates
between the usage of the GAL with PWs in MPLS and MPLS-TP
environments in Section 4.2 as follows:
In MPLS-TP, the GAL MUST be used with packets on a G-ACh on LSPs,
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