Network Working Group G. Bernstein
Internet Draft Grotto Networking
Intended status: Standards Track Y. Lee
Expires: September 2012 D. Li
Huawei
W. Imajuku
NTT
March 6, 2012
General Network Element Constraint Encoding for GMPLS Controlled
Networks
draft-ietf-ccamp-general-constraint-encode-07.txt
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Bernstein and Lee Expires September 6, 2012 [Page 1]
Internet-Draft General Network Element Constraint Encoding March 2012
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Abstract
Generalized Multiprotocol Label Switching can be used to control a
wide variety of technologies. In some of these technologies network
elements and links may impose additional routing constraints such as
asymmetric switch connectivity, non-local label assignment, and label
range limitations on links.
This document provides efficient, protocol-agnostic encodings for
general information elements representing connectivity and label
constraints as well as label availability. It is intended that
protocol-specific documents will reference this memo to describe how
information is carried for specific uses.
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 RFC-2119 [RFC2119].
Table of Contents
1. Introduction...................................................3
1.1. Node Switching Asymmetry Constraints......................3
1.2. Non-Local Label Assignment Constraints....................4
1.3. Change Log................................................5
2. Encoding.......................................................5
2.1. Link Set Field............................................5
2.2. Label Set Field...........................................7
2.2.1. Inclusive/Exclusive Label Lists......................8
2.2.2. Inclusive/Exclusive Label Ranges.....................9
2.2.3. Bitmap Label Set.....................................9
2.3. Available Labels Sub-TLV.................................10
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2.4. Shared Backup Labels Sub-TLV.............................11
2.5. Connectivity Matrix Sub-TLV..............................11
2.6. Port Label Restriction sub-TLV...........................13
2.6.1. SIMPLE_LABEL........................................14
2.6.2. CHANNEL_COUNT.......................................14
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