Abstract: The principles of mobile IP and hierarchical mobile IP are introduced. Also the FA fault tolerance issue in hierarchical mobile IP is discussed. Several FA fault tolerance schemes are compared. A new efficient scheme is proposed. This scheme utilizes the FA at the same level to backup each other. So it can bypass FA in failure instantly.

摘要： 介绍了Mobile IP和分层Mobile IP的原理，分析了分层Mobile IP中的FA容错问题。在介绍已有的几种容错方案的基础上，提出了一种有效的FA容错方案，它利用同一级的FA相互作备份，能够迅速将发生故障的FA旁路掉，减少数据包的丢失。

关键词: Mobile IP, 外地代理, 分层Mobile IP, 容错

CLC Number: 

• TN925.93