A system, device, and method for establishing and removing a label switched path in a communication network uses a packet-driven mechanism rather than using an explicit signaling protocol to exchange label switching information from an upstream label switching device to a downstream label switching device....http://www.google.com.tw/patents/US7023846?utm_source=gb-gplus-share專利 US7023846 - System, device, and method for establishing and removing a label switched path in a communication network
