(At that time, P2P download software traffic represented by BitTorrent (hereinafter referred to as BT) occupied a lot of bandwidth of broadband access, and according to statistics, it has exceeded 50%. This brings great challenges to broadband access methods such as Ethernet access and other shared bandwidths. Many ports of access-layer switches are kept in line speed for a long time, which seriously affects users' normal use of Web, E-mail and other services. Video on demand and other services. Therefore, operators and enterprises use)