draft-vainshtein-mpls-gal-tc-ttl-handling-02.txt   draft-vainshtein-mpls-gal-tc-ttl-handling-03.txt 
Network Working Group A. Vainshtein Network Working Group A. Vainshtein
Internet-Draft ECI Telecom Internet-Draft ECI Telecom
Updates: 5586 (if approved) L. Andersson Updates: 5586 (if approved) L. Andersson
Intended status: Standards Track Huawei Technologies Co., Ltd Intended status: Standards Track Huawei Technologies Co., Ltd
Expires: March 24, 2016 A. Farrel Expires: March 27, 2016 A. Farrel
Juniper Networks Juniper Networks
September 21, 2015 September 24, 2015
Handling the TC and TTL fields in a Label Stack Entry that Contains the Handling the TC and TTL fields in a Label Stack Entry that Contains the
Generic Associated Channel Label Generic Associated Channel Label
draft-vainshtein-mpls-gal-tc-ttl-handling-02 draft-vainshtein-mpls-gal-tc-ttl-handling-03
Abstract Abstract
This document clarifies handling of the Traffic Class (TC) and Time- This document clarifies handling of the Traffic Class (TC) and Time-
to-Live (TTL) fields of a Label Stack Entry that contains the Generic to-Live (TTL) fields of a Label Stack Entry that contains the Generic
Associated Channel (G-ACh) Label (GAL). These clarifications are Associated Channel (G-ACh) Label (GAL). These clarifications are
intended to aid interoperability of implementations. intended to aid interoperability of implementations.
Original handling was defined in RFC 5586, and this document updates Original handling was defined in RFC 5586, and this document updates
that RFC. that RFC.
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on March 24, 2016. This Internet-Draft will expire on March 27, 2016.
Copyright Notice Copyright Notice
Copyright (c) 2015 IETF Trust and the persons identified as the Copyright (c) 2015 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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implementations might action the TC field before determining that the implementations might action the TC field before determining that the
GAL is present and so might be subject to poor or unexpected behavior GAL is present and so might be subject to poor or unexpected behavior
dependent on the setting of the field. dependent on the setting of the field.
This document clarifies the rules for setting and processing the TC This document clarifies the rules for setting and processing the TC
and TTL fields in the LSE that contains the GAL in an unambiguous way and TTL fields in the LSE that contains the GAL in an unambiguous way
without referring to any other documents. This will improve without referring to any other documents. This will improve
interoperability with implementations that are potentially flawed in interoperability with implementations that are potentially flawed in
their handling of these fields. It updates [RFC5586] in that regard. their handling of these fields. It updates [RFC5586] in that regard.
In summary, the objctive of this document is not to change the In summary, the objective of this document is not to change the
conformance requirements of existing implementations, but to enhance conformance requirements of existing implementations, but to enhance
the likelihood of new implementations interoperating with each other the likelihood of new implementations interoperating with each other
and with implementations already in the field. In particular, to and with implementations already in the field. In particular, to
improve the interoperability results where a new implemntation improve the interoperability results where a new implementation
interacts with a legacy implementation that may be sender or receiver interacts with a legacy implementation that may be sender or receiver
of an LSE that contains the GAL and that may be any of: of an LSE that contains the GAL and that may be any of:
o built with poor design considerations o built with poor design considerations
o implemented with a misunderstanding of RFC 5586 o implemented with a misunderstanding of RFC 5586
o over-zealous in its policing of RFC 5586 behavior o over-zealous in its policing of RFC 5586 behavior.
This document does not require existing implementations to change
their behavior.
2. Terminology 2. Terminology
2.1. Requirements Language 2.1. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119]. document are to be interpreted as described in [RFC2119].
2.2. Abbreviations 2.2. Abbreviations
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