Using chunk collision avoidance to optimize p2p live

When a group of nodes under the same authoritative domain (or ISP) collectively download a P2P video stream, it is desirable to minimize inter-ISP traffic. Ideally, each chunk of the stream would be downloaded by one of the nodes from an external peer, and then shared among all the nodes under the same ISP. If the same chunk is downloaded from external sources by to different peers of the same ISP, we can say that a "collision" happened. Enhanced collision avoidance techniques from MAC layer can be used in order to optimize the P2P live streaming download.