Analysis of Multihoming in Network Mobility Support
RFC 4980
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RFC - Informational
(October 2007; No errata)
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2015-10-14
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IETF
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RFC 4980 (Informational)
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Jari Arkko
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Network Working Group C. Ng
Request for Comments: 4980 Panasonic Singapore Labs
Category: Informational T. Ernst
INRIA
E. Paik
KT
M. Bagnulo
UC3M
October 2007
Analysis of Multihoming in Network Mobility Support
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
This document is an analysis of multihoming in the context of network
mobility (NEMO) in IPv6. As there are many situations in which
mobile networks may be multihomed, a taxonomy is proposed to classify
the possible configurations. The possible deployment scenarios of
multihomed mobile networks are described together with the associated
issues when network mobility is supported by RFC 3963 (NEMO Basic
Support). Recommendations are offered on how to address these
issues.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Classification . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1. (1,1,1): Single MR, Single HA, Single MNP . . . . . . . . 6
2.2. (1,1,n): Single MR, Single HA, Multiple MNPs . . . . . . . 6
2.3. (1,n,1): Single MR, Multiple HAs, Single MNP . . . . . . . 7
2.4. (1,n,n): Single MR, Multiple HAs, Multiple MNPs . . . . . 8
2.5. (n,1,1): Multiple MRs, Single HA, Single MNP . . . . . . . 8
2.6. (n,1,n): Multiple MRs, Single HA, Multiple MNPs . . . . . 9
2.7. (n,n,1): Multiple MRs, Multiple HAs, Single MNP . . . . . 9
2.8. (n,n,n): Multiple MRs, Multiple HAs, Multiple MNPs . . . . 10
Ng, et al. Informational [Page 1]
RFC 4980 Analysis of Multihoming in NEMO October 2007
3. Deployment Scenarios and Prerequisites . . . . . . . . . . . . 11
3.1. Deployment Scenarios . . . . . . . . . . . . . . . . . . . 11
3.2. Prerequisites . . . . . . . . . . . . . . . . . . . . . . 13
4. Multihoming Issues . . . . . . . . . . . . . . . . . . . . . . 14
4.1. Fault Tolerance . . . . . . . . . . . . . . . . . . . . . 14
4.1.1. Failure Detection . . . . . . . . . . . . . . . . . . 15
4.1.2. Path Exploration . . . . . . . . . . . . . . . . . . . 16
4.1.3. Path Selection . . . . . . . . . . . . . . . . . . . . 17
4.1.4. Re-Homing . . . . . . . . . . . . . . . . . . . . . . 19
4.2. Ingress Filtering . . . . . . . . . . . . . . . . . . . . 19
4.3. HA Synchronization . . . . . . . . . . . . . . . . . . . . 21
4.4. MR Synchronization . . . . . . . . . . . . . . . . . . . . 22
4.5. Prefix Delegation . . . . . . . . . . . . . . . . . . . . 23
4.6. Multiple Bindings/Registrations . . . . . . . . . . . . . 23
4.7. Source Address Selection . . . . . . . . . . . . . . . . . 23
4.8. Loop Prevention in Nested Mobile Networks . . . . . . . . 24
4.9. Prefix Ownership . . . . . . . . . . . . . . . . . . . . . 24
4.10. Preference Settings . . . . . . . . . . . . . . . . . . . 25
5. Recommendations to the Working Group . . . . . . . . . . . . . 26
6. Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7. Security Considerations . . . . . . . . . . . . . . . . . . . 28
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 29
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 29
9.1. Normative References . . . . . . . . . . . . . . . . . . . 29
9.2. Informative References . . . . . . . . . . . . . . . . . . 29
Appendix A. Alternative Classifications Approach . . . . . . . . 32
A.1. Ownership-Oriented Approach . . . . . . . . . . . . . . . 32
A.1.1. ISP Model . . . . . . . . . . . . . . . . . . . . . . 32
A.1.2. Subscriber/Provider Model . . . . . . . . . . . . . . 33
A.2. Problem-Oriented Approach . . . . . . . . . . . . . . . . 34
Appendix B. Nested Tunneling for Fault Tolerance . . . . . . . . 35
B.1. Detecting Presence of Alternate Routes . . . . . . . . . . 35
B.2. Re-Establishment of Bi-Directional Tunnels . . . . . . . . 36
B.2.1. Using Alternate Egress Interface . . . . . . . . . . . 36
B.2.2. Using Alternate Mobile Router . . . . . . . . . . . . 36
B.3. To Avoid Tunneling Loop . . . . . . . . . . . . . . . . . 37
B.4. Points of Considerations . . . . . . . . . . . . . . . . . 37
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