Patent ID: 8107385

Claim:
A method comprising: receiving by a third node a request for a quality-of-service measurement of a network path between a first node in a first subnetwork and a second node in a second subnetwork through the third node, wherein the network path fails to provide a quality-of-service guarantee; generating by the third node the quality-of-service measurement for the network path, wherein the quality-of-service measurement is based on: (i) a first series of probe responses that corresponds to a first probing, by the third node, of a member node of the first subnetwork other than the first node, wherein the first probing is via a first span between the third node and the member node of the first subnetwork, and (ii) a second series of probe responses that corresponds to a second probing, by the third node, of a member node of the second subnetwork, wherein the second probing is via a second span between the third node and the member node of the second subnetwork; and receiving by the third node a list of nodes that are part of the first subnetwork, wherein the first node is on the list of nodes.