Patent ID: 7349328

Claim:
A routing system comprising: (A) an active system routing device including: a storage unit storing a first address and a second address in away that maps the first address and the second address to each other on the basis of a registration request sent from a mobile node having the first address and the second address, the registration request containing the first address and the second address mapping to each other; a general data forwarding unit forwarding general data to the second address according to said storage unit; a registration request forwarding unit forwarding the registration request to a standby system routing device; where said storage unit further stores a value of priority level corresponding to the first address or the second address, and said registration request forwarding unit controls a process of forwarding the registration request in accordance with the value of priority level stored on said storage unit in a way that corresponds the value of priority level to the first address or the second address which are contained in the registration request; and (B) a standby system routing device, in addition to a storage unit and a general data forwarding unit corresponding to those included in said active system routing device, including: a monitoring unit monitoring a status of said active system routing device; and a switchover unit switching over said standby system routing device to an active system if said monitoring unit judges that a fault occurs in said active system routing device.