Analysis of Inter-Domain Label Switched Path (LSP) Recovery
RFC 5298
Network Working Group T. Takeda, Ed.
Request for Comments: 5298 NTT
Category: Informational A. Farrel, Ed.
Old Dog Consulting
Y. Ikejiri
NTT Communications
JP. Vasseur
Cisco Systems, Inc.
August 2008
Analysis of Inter-Domain Label Switched Path (LSP) Recovery
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.
Abstract
Protection and recovery are important features of service offerings
in Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS)
networks. Increasingly, MPLS and GMPLS networks are being extended
from single domain scope to multi-domain environments.
Various schemes and processes have been developed to establish Label
Switched Paths (LSPs) in multi-domain environments. These are
discussed in RFC 4726: "A Framework for Inter-Domain Multiprotocol
Label Switching Traffic Engineering".
This document analyzes the application of these techniques to
protection and recovery in multi-domain networks. The main focus for
this document is on establishing end-to-end diverse Traffic
Engineering (TE) LSPs in multi-domain networks.
Takeda, et al. Informational [Page 1]
RFC 5298 Analysis of Inter-Domain LSP Recovery August 2008
Table of Contents
1. Introduction ....................................................3
1.1. Terminology ................................................3
1.2. Domain .....................................................4
1.3. Document Scope .............................................5
1.4. Note on Other Recovery Techniques ..........................6
1.5. Signaling Options ..........................................6
2. Diversity in Multi-Domain Networks ..............................6
2.1. Multi-Domain Network Topology ..............................7
2.2. Note on Domain Diversity ...................................8
3. Factors to Consider .............................................9
3.1. Scalability versus Optimality ..............................9
3.2. Key Concepts ..............................................10
4. Diverse LSP Setup Schemes without Confidentiality ..............12
4.1. Management Configuration ..................................12
4.2. Head-End Path Computation (with Multi-Domain Visibility) ..12
4.3. Per-Domain Path Computation ...............................12
4.3.1. Sequential Path Computation ........................13
4.3.2. Simultaneous Path Computation ......................14
4.4. Inter-Domain Collaborative Path Computation ...............15
4.4.1. Sequential Path Computation ........................15
4.4.2. Simultaneous Path Computation ......................15
5. Diverse LSP Setup Schemes with Confidentiality .................16
5.1. Management Configuration ..................................17
5.2. Head-End Path Computation (with Multi-Domain Visibility) ..17
5.3. Per-Domain Path Computation ...............................17
5.3.1. Sequential Path Computation ........................18
5.3.2. Simultaneous Path Computation ......................19
5.4. Inter-Domain Collaborative Path Computation ...............20
5.4.1. Sequential Path Computation ........................20
5.4.2. Simultaneous Path Computation ......................20
6. Network Topology Specific Considerations .......................20
7. Addressing Considerations ......................................21
8. Note on SRLG Diversity .........................................21
9. Security Considerations ........................................21
10. References ....................................................22
10.1. Normative References .....................................22
10.2. Informative References ...................................22
11. Acknowledgements ..............................................25
Takeda, et al. Informational [Page 2]
RFC 5298 Analysis of Inter-Domain LSP Recovery August 2008
1. Introduction
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