Pseudowire Control Word Negotiation Mechanism Update
draft-ietf-pwe3-cbit-negotiation-03
Network Working Group Lizhong Jin (ed.), ZTE
Internet-Draft Raymond Key (ed.), Huawei
Updates: 4447 (if approved) Simon Delord, Alcatel-Lucent
Category: Standards Track Thomas Nadeau, Juniper
Expires: October 13, 2012 Vishwas Manral, Hewlett-Packard
Sami Boutros, Cisco
Reshad Rahman, Cisco
April 13, 2012
Pseudowire Control Word Negotiation Mechanism Update
draft-ietf-pwe3-cbit-negotiation-03
Abstract
This document describes the problem of control word negotiation
mechanism specified in [RFC4447]. Based on the problem analysis, a
message exchanging mechanism is introduced to solve this control word
negotiation issue. This document is to update [RFC4447] control word
negotiation mechanism.
Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on April 13, 2012.
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Copyright Notice
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document authors. All rights reserved.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Problem Statement . . . . . . . . . . . . . . . . . . . . . . . 3
3. Control word re-negotiation by label request message . . . . . . 4
4. Backward Compatibility . . . . . . . . . . . . . . . . . . . . . 6
5. Security Considerations . . . . . . . . . . . . . . . . . . . . 6
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 6
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
8.1. Normative References . . . . . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 7
Appendix A. Updated C-bit Handling Procedures Diagram . . . . . . . 8
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].
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1. Introduction
This document describes the problem of control word negotiation
mechanism specified in [RFC4447]. Based on the problem analysis, a
message exchanging mechanism is introduced to solve this negotiation
issue. The control word negotiation mechanism in this document is to
update [RFC4447] section 6.2 "PW Types for Which the Control Word is
NOT Mandatory".
2. Problem Statement
[RFC4447] section 6 describes the control word negotiation mechanism.
Each PW endpoint has the capability of being configurable with a
parameter that specifies whether the use of the control word is
PREFERRED or NOT PREFERRED. While in some case of control word
negotiation, PE will advertise C-bit=0 in label mapping message with
its locally configured control word PREFERRED. This kind of behavior
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