Framework for Generalized Multi-Protocol Label Switching (GMPLS)-based Control of Synchronous Digital Hierarchy/Synchronous Optical Networking (SDH/SONET) Networks
RFC 4257
Document | Type | RFC - Informational (December 2005; No errata) | |
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Authors | Vishal Sharma , Greg Bernstein , Eric Gray , Eric Mannie | ||
Last updated | 2013-03-02 | ||
Stream | Internet Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 4257 (Informational) | |
Action Holders |
(None)
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Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Alex Zinin | ||
Send notices to | (None) |
Network Working Group G. Bernstein Request for Comments: 4257 Grotto Networking Category: Informational E. Mannie Perceval V. Sharma Metanoia, Inc. E. Gray Marconi Corporation, plc December 2005 Framework for Generalized Multi-Protocol Label Switching (GMPLS)-based Control of Synchronous Digital Hierarchy/Synchronous Optical Networking (SDH/SONET) Networks 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 Generalized Multi-Protocol Label Switching (GMPLS) is a suite of protocol extensions to MPLS to make it generally applicable, to include, for example, control of non packet-based switching, and particularly, optical switching. One consideration is to use GMPLS protocols to upgrade the control plane of optical transport networks. This document illustrates this process by describing those extensions to GMPLS protocols that are aimed at controlling Synchronous Digital Hierarchy (SDH) or Synchronous Optical Networking (SONET) networks. SDH/SONET networks make good examples of this process for a variety of reasons. This document highlights extensions to GMPLS-related routing protocols to disseminate information needed in transport path computation and network operations, together with (G)MPLS protocol extensions required for the provisioning of transport circuits. New capabilities that an GMPLS control plane would bring to SDH/SONET networks, such as new restoration methods and multi-layer circuit establishment, are also discussed. Bernstein, et al. Informational [Page 1] RFC 4257 GMPLS based Control of SDH/SONET December 2005 Table of Contents 1. Introduction ....................................................3 1.1. MPLS Overview ..............................................3 1.2. SDH/SONET Overview .........................................5 1.3. The Current State of Circuit Establishment in SDH/SONET Networks .........................................7 1.3.1. Administrative Tasks ................................8 1.3.2. Manual Operations ...................................8 1.3.3. Planning Tool Operation .............................8 1.3.4. Circuit Provisioning ................................8 1.4. Centralized Approach versus Distributed Approach ...........9 1.4.1. Topology Discovery and Resource Dissemination ......10 1.4.2. Path Computation (Route Determination) .............10 1.4.3. Connection Establishment (Provisioning) ............10 1.5. Why SDH/SONET Will Not Disappear Tomorrow .................12 2. GMPLS Applied to SDH/SONET .....................................13 2.1. Controlling the SDH/SONET Multiplex .......................13 2.2. SDH/SONET LSR and LSP Terminology .........................14 3. Decomposition of the GMPLS Circuit-Switching Problem Space .....14 4. GMPLS Routing for SDH/SONET ....................................15 4.1. Switching Capabilities ....................................16 4.1.1. Switching Granularity ..............................16 4.1.2. Signal Concatenation Capabilities ..................17 4.1.3. SDH/SONET Transparency .............................19 4.2. Protection ................................................20 4.3. Available Capacity Advertisement ..........................23 4.4. Path Computation ..........................................24 5. LSP Provisioning/Signaling for SDH/SONET .......................25 5.1. What Do We Label in SDH/SONET? Frames or Circuits? .......25 5.2. Label Structure in SDH/SONET ..............................26 5.3. Signaling Elements ........................................27 6. Summary and Conclusions ........................................29 7. Security Considerations ........................................29 8. Acknowledgements ...............................................30 9. Informative References .........................................31 10. Acronyms ......................................................33 Bernstein, et al. Informational [Page 2]Show full document text