A network router initially communicates over a primary data path. Upon detection of an error condition associated with the primary data path, the network router initiates a layer 2 switch such that the communication occurring over the primary data path is switched to a backup data path. The layer 2 switch...http://www.google.com/patents/US20050021844?utm_source=gb-gplus-sharePatent US20050021844 - Network router that efficiently switches between a primary data path and a backup data path
