A Framework for Inter-Domain Multiprotocol Label Switching Traffic Engineering
RFC 4726
Document | Type | RFC - Informational (November 2006; No errata) | |
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Authors | Vasseur Jp , Adrian Farrel , Arthi Ayyangar | ||
Last updated | 2018-12-20 | ||
Replaces | draft-farrel-ccamp-inter-domain-framework | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 4726 (Informational) | |
Action Holders |
(None)
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Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Ross Callon | ||
Send notices to | (None) |
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 Gateway Protocols (IGPs) (i.e., Intermediate System to Intermediate System (IS-IS) and OSPF). This document introduces the techniques for establishing TrafficShow full document text