A loopback processing method includes detecting a loopback at a first entity in a wide area network. The detection is accomplished by recognizing that a “memorized” frame has returned on the same communications interface within a given period of time. The time interval between sending the frame and...http://www.google.fr/patents/US7054338?utm_source=gb-gplus-shareBrevet US7054338 - Loopback processing method and apparatus
