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

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.

中图分类号: 

• TN925.93