336 CHAPTER 18: MULTICAST P ROTOCOLUsing undo pim command, you can clear the configuration in PIM view, and back tosystem view.Configuring Sending Interval for the Hello PacketsAfter PIM is enabled on an interface, it will send Hello messages periodically on theinterface. The interval at which Hello messages are sent can be modified according tothe bandwidth and type of the network connected to the interface.Perform the following configuration in Interface view.The default interval is 30 seconds. You can configure the value according to differentnetwork environments. Generally, this parameter does not need to be modified.This configuration can be performed only after PIM (PIM-DM or PIM-SM) is enabled inInterface View.Configuring the Filtering of Multicast Source/GroupYou can set to filter the source (and group) address of multicast data packets via thiscommand. When this feature is configured, the router filters not only multicast data,but the multicast data encapsulated in the registration packets.Perform the following configuration in the PIM view.If resource address filtering is configured, as well as basic ACLs, then the router filtersthe resource addresses of all multicast data packets received. Those not matched willbe discarded.If resource address filtering is configured, as well as advanced ACLs, then the routerfilters the resource and group addresses of all multicast data packets received. Thosenot matched will be discarded.Configuring the Filtering of PIM NeighborYou can set to filter the PIM neighbors on the current interface via the followingconfiguration.Perform the following configuration in the PIM View.By default, no filtering rules are set.Table 343 Configuring hello message interval on an interfaceOperation CommandConfigure the hello message interval on an interface pim timer hello secondsRestore the interval to the default value undo pim timer helloTable 344 Configuring the filtering of multicast source/groupOperation CommandConfigure the filtering of multicast source/group source-policy acl_numberRemove the configuration of filtering undo source-policyTable 345 Configuring the filtering of PIM neighborOperation CommandConfigure filtering of PIM neighbor pim neighbor-policy acl_numberRemove the configuration of filtering undo pim neighbor-policy
