Requirements for Inter-Area MPLS Traffic Engineering
RFC 4105
| Document | Type | RFC - Informational (June 2005; No errata) | |
|---|---|---|---|
| Authors | Jean-Louis Le Roux , Vasseur Jp , Jim Boyle | ||
| Last updated | 2015-10-14 | ||
| Stream | Internent 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 4105 (Informational) | |
| Action Holders |
(None)
|
||
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Bert Wijnen | ||
| Send notices to | (None) | ||
Network Working Group J.-L. Le Roux, Ed.
Request for Comments: 4105 France Telecom
Category: Informational J.-P. Vasseur, Ed.
Cisco Systems, Inc.
J. Boyle, Ed.
PDNETs
June 2005
Requirements for Inter-Area MPLS 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 Internet Society (2005).
Abstract
This document lists a detailed set of functional requirements for the
support of inter-area MPLS Traffic Engineering (inter-area MPLS TE).
It is intended that solutions that specify procedures and protocol
extensions for inter-area MPLS TE satisfy these requirements.
Table of Contents
1. Introduction ....................................................2
2. Conventions Used in This Document ...............................3
3. Terminology .....................................................3
4. Current Intra-Area Uses of MPLS Traffic Engineering .............4
4.1. Intra-Area MPLS Traffic Engineering Architecture ...........4
4.2. Intra-Area MPLS Traffic Engineering Applications ...........4
4.2.1. Intra-Area Resource Optimization ....................4
4.2.2. Intra-Area QoS Guarantees ...........................5
4.2.3. Fast Recovery within an IGP Area ....................5
4.3. Intra-Area MPLS TE and Routing .............................6
5. Problem Statement, Requirements, and Objectives of Inter-Area ...6
5.1. Inter-Area Traffic Engineering Problem Statement ...........6
5.2. Overview of Requirements for Inter-Area MPLS TE ............7
5.3. Key Objectives for an Inter-Area MPLS-TE Solution ..........8
5.3.1. Preserving the IGP Hierarchy Concept ................8
5.3.2. Preserving Scalability ..............................8
6. Application Scenario.............................................9
Le Roux, et al. Informational [Page 1]
RFC 4105 Inter-Area MPLS TE Reqs June 2005
7. Detailed Requirements for Inter-Area MPLS TE ...................10
7.1. Inter-Area MPLS TE Operations and Interoperability ........10
7.2. Inter-Area TE-LSP Signaling ...............................10
7.3. Path Optimality ...........................................11
7.4. Inter-Area MPLS-TE Routing ................................11
7.5. Inter-Area MPLS-TE Path Computation .......................12
7.6. Inter-Area Crankback Routing ..............................12
7.7. Support of Diversely-Routed Inter-Area TE LSPs ............13
7.8. Intra/Inter-Area Path Selection Policy ....................13
7.9. Reoptimization of Inter-Area TE LSP .......................13
7.10. Inter-Area LSP Recovery ..................................14
7.10.1. Rerouting of Inter-Area TE LSPs ..................14
7.10.2. Fast Recovery of Inter-Area TE LSP ...............14
7.11. DS-TE support ............................................15
7.12. Hierarchical LSP Support .................................15
7.13. Hard/Soft Preemption .....................................15
7.14. Auto-Discovery of TE Meshes ..............................16
7.15. Inter-Area MPLS TE Fault Management Requirements .........16
7.16. Inter-Area MPLS TE and Routing ...........................16
8. Evaluation criteria ............................................17
8.1. Performances ..............................................17
8.2. Complexity and Risks ......................................17
8.3. Backward Compatibility ....................................17
9. Security Considerations ........................................17
10. Acknowledgements ..............................................17
11. Contributing Authors ..........................................18
12. Normative References ..........................................19
13. Informative References ........................................19
1. Introduction
The set of MPLS Traffic Engineering components, defined in [RSVP-TE],
[OSPF-TE], and [ISIS-TE], which supports the requirements defined in
[TE-REQ], is used today by many network operators to achieve major
Traffic Engineering objectives defined in [TE-OVW]. These objectives
include:
- Aggregated Traffic measurement
- Optimization of network resources utilization
- Support for services requiring end-to-end QoS guarantees
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