When the routing function of router becomes disabled, a routing stop message is multicast to all terminals and another router in a LAN. If another router can provide the routing function, a routing start message is multicast to all terminals and the other router in the LAN. This method allows the terminals...http://www.google.ca/patents/US7764696?utm_source=gb-gplus-sharePatent US7764696 - Routing control method, router, and terminal
