移动IPv6网络家乡代理容错方法研究

移动IPv6基于家乡代理的转发,实现节点移动过程中的可寻址性.提出主动检测和迁移的家乡代理容错方法,通过在家乡代理之间设计环状检测和备份链,使家乡代理之间相互检测失效情况的发生;所有注册信息在家乡链路上仅备份一次;检测到失效后,有效家乡代理自动地暂时接管失效家乡代理的工作,并主动通告给相关移动节点;移动节点收到家乡代理失效信息后,主动启动恢复过程.给出了实现该方法的数据结构和容错算法,描述了具体的容错处理过程.通过理论分析证明了该方法比协议标准中的方法具有更小的容错时间和信令开销,特别是在移动节点的移动频率较慢的情况下更是如此.

Research on Home Agent Fault-Tolerant Approach for Mobile IPv6 Networks

Mobile node (MN) is reachable based on home agent (HA) in mobile IPv6 (MIPv6). This paper proposes the active detection and transfer HA fault-tolerant method (ADTM) for MIPv6 networks. It defines the conception of ring detection & backup chain (D&B chain) among HAs in the same link. An MN only backups its registration information on the next HA in the D&B chain. For any HA, its previous HA and its next HA in the D&B chain detect the HA's validation based on neighbor discovery mechanism. If an HA is detected failure, its next HA will take over the failed HA temporarily, then inform the failure information to MNs served by the failed HA. An MN received the failure information will select a new valid and perform home registration again. For implementing ADTM, this paper defines the data structures, designs the fault-tolerant algorithm and describes the procedure in detail. It is proved that this method has less fault-tolerant time and less signal cost than the method in RFC 3775, especially in the scenario of MN moving more frequently.