一种基于外地代理的移动IP组播机制的研究

Research on Mobile IP Multicast Mechanism Based on Foreign Agent

在继承ABMoM方案优点的基础上,本文提出一个组合远程预订、双向隧道技术的基于外地代理的移动IP组播方案。与ABMoM相比,由外地代理来支持组播,兼任本地组播路由器的职责。移动主机直接向外地代理登记,外地代理通过改进的组管理协议来管理本地组成员,并使用任何路由机制和其它组播路由器进行交流。很好地解决了组播代理和外地代理之间的通信开销问题,同时通过改进组管理协议和引入外地代理的缓冲技术,能减小切换所造成的影响,保证子网的平滑切换。

Inheriting the advantages of ABMoM,a mobile IP multicast based on foreign agent scheme is proposed.Compared with the ABMoM,the foreign agent supports multicast,acting as a local multicast router.The mobile host directly regists to the foreign agent which uses improved group management protocol to manage the local group members,and any routing mechanism to communicate with the other multicast routers.Combining remote reservations and binary tunnel technology,this new scheme proposes a good solution to the communication overhead between the multicast agent and foreign agent.The introduction of FA buffer technology can reduce the impact of switching to ensure that smooth handoff between subnets.