1. Hierarchical MIPv6 mobility management (HMIPv6)
Hesham Soliman, Ericsson Claude Castelluccia, INRIA
Karim El-Malki, Ericsson Ludovic Bellier, INRIA July, 2001
Presented by 徐建鈞,
1/14/2004

2. Outline Introduction Overview of HMIPv6 Map Discovery Operation modes
Comparison between the two modes of operation
Conclusion
Reference

3. Introduction
A new node called the mobility Anchor Point (MAP) is used in the HMIPv6.
The MAP will limit the amount of Mobile IPV6 signaling outside the local domain.
Two modes are proposed in the memo, based on the usage of RCoA.

4. Overview of HMIPv6
A MN only needs to perform one local BU to a MAP when changing attached point within the MAP domain.
When using an RCoA, a MAP acts as a local Home Agent (HA) for the MN.

5. Overview of HMIPv6
MAP concept is simply an extension to the MIPv6 protocol.
Furthermore, a MN can at any time stop using the MAP . This provides great flexibility.

6. Overview of HMIPv6 Hierarchical MIPv6 domain HA CA MAP2 AR1 AR2 MN
RCoA2

7. Map Discovery
How a MN obtains the MAP address and subnet prefix and how ARs in a domain discover MAPs.
Two different methods:
Dynamic MAP Discovery
Router Renumbering

8. Map Discovery(cont.) Dynamic MAP Discovery
From the MAP to the MN through certain router interface
Defaut preference
Right interface to send the MAP option
Initial value of the Distance field

9. Map Discovery(cont.)

10. Map Discovery(cont.) Router Renumbering
A set of message that can be used to renumber certain interface on a router.
Prefix code operation(PCO) and is included in the Match prefix part of the message.
Best suited to large network

11. Map Discovery(cont.) Router Renumbering 0 1 2 3
| OpCode | OpLength | Ordinal | MatchLen|
| MinLen | MaxLen | reserved | | MatchPrefix | |

12. Map Discovery(cont.)

13. Map Discovery(cont.) Router Renumbering Extened Fields:
OpCode MatchPrefix matches an interface's prefix or address. Values are: 1. the ADD operation 2. the CHANGE operation 3. the SET-GLOBAL operation 4. the PROPAGATE operation (new code).

14. Operation modes Basic mode: Supporting Mobile Nodes
Extended mode :Supporting MNs and Mobile Network

15. Operation modes(cont.)CN HA
(HA,RCoA)
(HA,RCoA) BU
Basic mode
Data
Internet
(HA,LCoA) CN
MAP
(RCoA,LCoA)
LCoA

16. Operation modes(cont.)
Extended mode: MN sends a BU to the MAP
- The M flags set, - The MNs Home Address in the Home Address field, The MNs LCoA as the CoA.

17. Operation modes(cont.)
Extended mode: MN sends a BU to HA
- The LCoA as a source address, - The Home Address in the Home Address
field and, - An alternate-CoA suboption containing its
RCoA.

18. Comparison between the two modes of operation
The headers in the packet
Appropriate header compression mechanism
DAD delays during inter-MAP mobility
MN may register its new LCoA to the previous MAP

19. Conclusion The author makes a simulation in the other paper.
I will make a presentation about the handoff management in the next meeting.

20. Reference
[1] D. Johnson and C. Perkins, "Mobility Support in IPv6", draft-ietf-mobileip-ipv6-13.txt, February [2] E. Gustafsson et al, "Mobile IP Regional Tunnel Management", draft-ietf-mobileip-reg-tunnel-05. Work in progress March [3] K. ElMalki, Editor, et al, "Low latency Handoffs in Mobile IPv4". draft-ietf-mobileip-lowlatency-handoffs-v4-00. work in progress. [4] G. Tsirtsis, Editor, et al,"Fast Handovers for Mobile IPv6", draft-ietf-mobileip-fast-mipv6-00.txt. Work in progress. [5] M. Crawford ŸRouter Renumbering for IPv6÷. RFC [6] S. Thomson and T. Narten "IPv6 Stateless Address Autoconfiguration". RFC 2462.