A Framework for Inter-Domain Multiprotocol Label Switching Traffic Engineering
RFC 4726
Network Working Group A. Farrel
Request for Comments: 4726 Old Dog Consulting
Category: Informational J.-P. Vasseur
Cisco Systems, Inc.
A. Ayyangar
Nuova Systems
November 2006
A Framework for Inter-Domain Multiprotocol Label Switching
Traffic Engineering
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 IETF Trust (2006).
Abstract
This document provides a framework for establishing and controlling
Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS)
Traffic Engineered (TE) Label Switched Paths (LSPs) in multi-domain
networks.
For the purposes of this document, a domain is considered to be any
collection of network elements within a common sphere of address
management or path computational responsibility. Examples of such
domains include Interior Gateway Protocol (IGP) areas and Autonomous
Systems (ASes).
Farrel, et al. Informational [Page 1]
RFC 4726 Framework for Inter-Domain TE November 2006
Table of Contents
1. Introduction ....................................................3
1.1. Nested Domains .............................................3
2. Signaling Options ...............................................4
2.1. LSP Nesting ................................................4
2.2. Contiguous LSP .............................................5
2.3. LSP Stitching ..............................................5
2.4. Hybrid Methods .............................................6
2.5. Control of Downstream Choice of Signaling Method ...........6
3. Path Computation Techniques .....................................6
3.1. Management Configuration ...................................7
3.2. Head-End Computation .......................................7
3.2.1. Multi-Domain Visibility Computation .................7
3.2.2. Partial Visibility Computation ......................7
3.2.3. Local Domain Visibility Computation .................8
3.3. Domain Boundary Computation ................................8
3.4. Path Computation Element ...................................9
3.4.1. Multi-Domain Visibility Computation ................10
3.4.2. Path Computation Use of PCE When Preserving
Confidentiality ....................................10
3.4.3. Per-Domain Computation Elements ....................10
3.5. Optimal Path Computation ..................................11
4. Distributing Reachability and TE Information ...................11
5. Comments on Advanced Functions .................................12
5.1. LSP Re-Optimization .......................................12
5.2. LSP Setup Failure .........................................13
5.3. LSP Repair ................................................14
5.4. Fast Reroute ..............................................14
5.5. Comments on Path Diversity ................................15
5.6. Domain-Specific Constraints ...............................16
5.7. Policy Control ............................................17
5.8. Inter-Domain Operations and Management (OAM) ..............17
5.9. Point-to-Multipoint .......................................17
5.10. Applicability to Non-Packet Technologies .................17
6. Security Considerations ........................................18
7. Acknowledgements ...............................................19
8. Normative References ...........................................19
9. Informative References .........................................20
Farrel, et al. Informational [Page 2]
RFC 4726 Framework for Inter-Domain TE November 2006
1. Introduction
The Traffic Engineering Working Group has developed requirements for
inter-area and inter-AS Multiprotocol Label Switching (MPLS) Traffic
Engineering in [RFC4105] and [RFC4216].
Various proposals have subsequently been made to address some or all
of these requirements through extensions to the Resource Reservation
Protocol Traffic Engineering extensions (RSVP-TE) and to the Interior
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