Route switching methods and systems

摘要

A route switching method, when a mobile node is switching between access routers, the method comprises: the second access router sending a context transfer message to the third access router, the third access router updating a Cache for Destination Terminal and a Cache for Source Terminal in a cache of the third access router according to the context transfer message; the second access router updating its cache according to the context transfer message, and updating a Cache for Destination Terminal in a cache of a first access router. Several route switching methods and route switching systems are also involved. Based on the Context Transfer Protocol, it enables the access router to transfer the address information of the mobile node associated with a session connection by the context transfer message directly during the switching, without the process in which the new access router inquires the routing manager, thereby reducing the delay caused by inquiring the routing manager, and thus decreasing the possibility of message lost.

主权项

1. A route switching method for switching an access router of a second mobile node from a second access router to a third access router, the method comprising:
receiving, by the third access router, a context transfer message sent by the second access router, the context transfer message comprising an Internet Protocol (IP)-host address of the second mobile node, an IP-host address of a first mobile node and an IP-routing address of the first mobile node, wherein the first mobile node has an established session connection with the second mobile node; updating, by the third access router, a Cache for Destination Terminal and a Cache for Source Terminal in a cache of the third access router according to the context transfer message, the Cache for Destination Terminal in the cache of the third access router including a mapping relation between the IP-host address of the first mobile node and the IP-routing address of the first mobile node, and the Cache for Source Terminal in the cache of the third access router including a mapping relation between the IP-host address of the second mobile node and an IP-routing address of the second mobile node; performing IP in IP encapsulation, by the third access router, on a data packet when the second mobile node sends the data packet to the first mobile node via the third access router, with the IP-routing address of the first mobile node and the IP-routing address of the second mobile node being a destination address and a source address of an outer encapsulation respectively, and with a location update header being used in an outer IP packet, the location update header indicating the IP-host address and IP-routing address of the second mobile node; and sending the encapsulated data packet to a first access router which is connected to the first mobile node.