In one embodiment, a method includes obtaining a first packet that has a first payload. The first payload identifies a first path between endpoints traversed by the first packet, and identifying information associated with a first node associated with the first path traversed by the first packet. The...http://www.google.com/patents/US8116200?utm_source=gb-gplus-sharePatent US8116200 - Source routing approach for network performance and availability measurement of specific paths
