Method of providing a recovery plan for a connection in a communications network when the connection is disrupted by a failure of a switch, switch or link in the network. In a provisioning phase, a primary plan and recovery plan for a connection to be protected in a communications network are developed....http://www.google.com.hk/patents/US6392989?utm_source=gb-gplus-share專利 US6392989 - High speed protection switching in label switched networks through pre-computation of alternate routes
