Operation Manual – MulticastH3C S7500 Series Ethernet Switches Chapter 7 PIM Configuration7-10Then, the last hop router sends a prune message with the RP bit to the RP hop by hop.When the RP receives the message, it will reversely forward the prune message to themulticast source. Thus, the multicast data stream is switched from the RPT to the SPT.After the RPT-to-SPT switchover, the multicast data will be sent from the multicastsource S to the receiver directly. Through the RPT-to-SPT switchover, the PIM-SM canestablish an SPT in a more economical way than PIM-DM.The related threshold value is not set on S7500 series Ethernet switches. When theswitch receives multicast data forwarded over the RPT, it will update the incominginterface automatically and sends a prune message to the RP.7.2 Common PIM ConfigurationComplete the following tasks to configure PIM:Task RemarksEnabling PIM-DM (PIM-SM) on the Interface RequiredConfiguring the Interval of Sending Hello Messages OptionalConfiguring PIM Neighbors OptionalClearing PIM Relevant Entries Optional7.2.1 Enabling PIM-DM (PIM-SM) on the InterfaceFollow these steps to enable PIM-DM (PIM-SM) on the interface:To do... Use the command... RemarksEnter system view system-view —Enable the multicastrouting protocolmulticastrouting-enable RequiredEnter VLAN interface view interface Vlan-interfaceinterface-number —Enable PIM-DM/PIM-SM pim dm / pim smOptionalConfigure the PIMprotocol type on theinterface.7.2.2 Configuring the Interval of Sending Hello MessagesPIM-DM must be enabled on each interface. After the configuration, PIM-DM will sendPIM Hello messages periodically and process protocol messages that the PIMneighbors send.
