Optimization method for protocol process on RP in PIM-SM

This invention discloses an optimization method for a protocol process on RP of PIM-SM including the following steps: When the exit interface of S, G route item on RP varies from non -empty to empty, the PIM module stamps an oNE-SHOT marker on the S, G route item. The PIM module removes the ONE-SHOT marker after the cut message sent to the source direction is triggered. PIM module polls the (S, G) route item, it won't send the cut message when examining the interface of S, G on RP is empty. This invention can stop multicast data flowing to RP along SPT tree from RP to the source continuously as soon as possible, saving network bandwidth effectively. 本发明公开了一种PIM-SM的RP上协议处理的优化方法，该方法包括以下步骤：RP上的(S，G)路由项的出接口由非空变为空时，PIM模块给该(S，G)路由项打上ONE-SHOT标志；向源方向发送的剪枝报文被触发后，PIM模块将该(S，G)路由项的ONE-SHOT标志去掉；PIM模块轮循(S，G)路由项，检查到RP上(S，G)路由项的出接口为空，不再发送剪枝报文。本发明能尽快地阻止组播数据继续沿RP到源的SPT树流向RP，有效地节约网络上的带宽，特别是当网络中存在多个数据流的情况下，节约量更大。