Requirements for Generalized Multi-Protocol Label Switching (GMPLS) Routing for the Automatically Switched Optical Network (ASON)
RFC 4258
Network Working Group D. Brungard, Ed.
Request for Comments: 4258 ATT
Category: Informational November 2005
Requirements for Generalized Multi-Protocol Label Switching (GMPLS)
Routing for the Automatically Switched Optical Network (ASON)
Status of This Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2005).
Abstract
The Generalized Multi-Protocol Label Switching (GMPLS) suite of
protocols has been defined to control different switching
technologies as well as different applications. These include
support for requesting Time Division Multiplexing (TDM) connections
including Synchronous Optical Network (SONET)/Synchronous Digital
Hierarchy (SDH) and Optical Transport Networks (OTNs).
This document concentrates on the routing requirements placed on the
GMPLS suite of protocols in order to support the capabilities and
functionalities of an Automatically Switched Optical Network (ASON)
as defined by the ITU-T.
Brungard, Ed. Informational [Page 1]
RFC 4258 GMPLS Routing for ASON November 2005
Table of Contents
1. Introduction ....................................................2
2. Conventions Used in This Document ...............................4
3. ASON Routing Architecture and Requirements ......................4
3.1. Multiple Hierarchical Levels of ASON Routing Areas (RAs) ...5
3.2. Hierarchical Routing Information Dissemination .............6
3.3. Configuration ..............................................8
3.3.1. Configuring the Multi-Level Hierarchy ...............8
3.3.2. Configuring RC Adjacencies ..........................8
3.4. Evolution ..................................................8
3.5. Routing Attributes .........................................8
3.5.1. Taxonomy of Routing Attributes ......................9
3.5.2. Commonly Advertised Information .....................9
3.5.3. Node Attributes ....................................10
3.5.4. Link Attributes ....................................11
4. Security Considerations ........................................12
5. Conclusions ....................................................12
6. Contributors ...................................................15
7. Acknowledgements ...............................................15
8. References .....................................................16
8.1. Normative References ......................................16
8.2. Informative References ....................................16
1. Introduction
The Generalized Multi-Protocol Label Switching (GMPLS) suite of
protocols provides, among other capabilities, support for controlling
different switching technologies. These include support for
requesting TDM connections utilizing SONET/SDH (see [T1.105] and
[G.707], respectively) as well as Optical Transport Networks (OTNs,
see [G.709]). However, there are certain capabilities that are
needed to support the ITU-T G.8080 control plane architecture for an
Automatically Switched Optical Network (ASON). Therefore, it is
desirable to understand the corresponding requirements for the GMPLS
protocol suite. The ASON control plane architecture is defined in
[G.8080]; ASON routing requirements are identified in [G.7715] and in
[G.7715.1] for ASON link state protocols. These Recommendations
apply to all [G.805] layer networks (e.g., SDH and OTN), and provide
protocol-neutral functional requirements and architecture.
This document focuses on the routing requirements for the GMPLS suite
of protocols to support the capabilities and functionality of ASON
control planes. This document summarizes the ASON requirements using
ASON terminology. This document does not address GMPLS applicability
or GMPLS capabilities. Any protocol (in particular, routing)
Brungard, Ed. Informational [Page 2]
RFC 4258 GMPLS Routing for ASON November 2005
applicability, design, or suggested extensions are strictly outside
the scope of this document. ASON (Routing) terminology sections are
provided in Appendixes 1 and 2.
The ASON routing architecture is based on the following assumptions:
- A network is subdivided based on operator decision and criteria
(e.g., geography, administration, and/or technology); the network
subdivisions are defined in ASON as Routing Areas (RAs).
- The routing architecture and protocols applied after the network
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