In one embodiment of the invention, a network system includes a boundary router, a second router, and an upstream link of the second router coupled between to the output port of the boundary router and an input port of the second router. The second router includes an admission control function and a...http://www.google.com.tw/patents/US7796608?utm_source=gb-gplus-share專利 US7796608 - Edge-based per-flow QoS admission control in a data network
