HMIPv6 移动IP技术 教学课件.pptVIP

HMIPv6rfc4140 Hierarchical Mobile IPv6 Mobility Management (HMIPv6) rfc5380 Hierarchical Mobile IPv6 (HMIPv6) Mobility Management rfc5213 Proxy Mobile IPv6 Drawbacks of Mobile IPv6 Mobile IPv6 Performance depends on Mobile IP registration time and MH-HA distance Reacts after L2 movement Introduces a period of service disruption after L2 movement until signaling is completed Optimization Schemes Hierarchical Mobile IPv6 Reduces MN to HA round trip delay Reduces the number of messages (ratio transmission efficiency) Fast Handover for Mobile IPv6 Anticipates Mobile IP messaging (before L2 movement) 11.2 Hierarchical Mobile IPv6 (HMIPv6) –RFC4140 - 5380 HMIPv6 requires new entities called Mobility Anchor Points (MAPs) in the visiting network. MAP acts as a local home agent. It is usually implemented on a router. Mobile nodes have to perform binding updates to home agents and correspondent nodes only when it firstly enters into a MAP domain. When mobile nodes move inside the MAP domain, they do not have to perform binding updates to home agent and correspondent nodes. Binding updates to the MAP are only needed. If HMIPv6 is not provided in a visited network, a mobile node performs normal MIPv6 protocol and gets connectivity to Internet. Figure 11-1. Hierarchical Mobile IPv6. 11.2.2 Terminology Access Router (AR): mobile nodes default router. On-link care-of address (LCoA): LCoA is an address obtained from the visited network via stateless address configuration mechanism. Prefix information is learned from Access Router Advertisement message from a default router, AR. In original MIPv6, this address type is simply called care-of address. 11.2.2 Terminology Mobility Anchor Point (MAP): MAP is a special router located in a visited network by a mobile node. MAP operates as a local home agent. Multiple MAPs may exist in a visited network. MAP domain: MAP domain is determined by Router Advertisement messages from access routers, which contain MAP information. R