Patent ID: 7852776
Filing Date: 2010-12-14
Classification: H04L,H04W

Abstract:
1. A routing loop detection control apparatus which is provided in a home agent of at least one of a plurality of mobile routers, said routine loop detection control apparatus comprising: a binding date message receiving section that receives a binding update message including an address of each of said plurality of mobile routers from each of said plurality of mobile routers, said binding update message being added with an access router option including an address of a host mobile router connected to each of said plurality of mobile routers; a binding cache storage that stores the address of each of said plurality of mobile routers received by the binding update message receiving section and binding information including the address of said host mobile router connected to each of said plurality of mobile routers; a loop detecting section that detects a routing loop among said plurality of mobile routers on the basis of said binding information acquired by said binding update message receiving section; a loop detection control section that, at addition or update of the binding information, accepts the binding information in a state where a lifetime shorter than a normal time is set with respect to the binding information and that, after a reply of a binding acknowledge message, controls said loop detecting section to make a verification as to whether or not the routing loop has occurred with respect to the accepted binding information; and a loop elimination control section that, when said loop detecting section has detected the routing loop, rejects the binding information upon receipt of a next binding update message relative to the binding information subjected to the setting of the shorter lifetime and further that, when the routing loop has not been detected by said loop detecting section, upon receipt of the next binding update message relative to the binding information subjected to the setting of the shorter lifetime, sets the normal lifetime with respect to the binding information and accepts the binding information.