Layer 3 Routing Commands 1582Syntaxip pim sparse-modeno ip pimDefault ConfigurationPIM not enabled by default.Command ModeGlobal Configuration modeUser GuidelinesOnly one of sparse or dense mode can be configured on a router.IGMP isautomatically enabled if PIM is enabled and disabled when PIM is disabled.IP multicast must be enabled for PIM to operate. ip multicast-routing is notdisabled or enabled by this command.It is recommended that IGMP snooping be disabled if IP multicast is enabledunless specifically required.PIM is not compatible with DVMRP. DVMRP must be disabled beforeenabling PIM.Exampleconsole(config)#ip pim sparse-modeip pim ssmUse the ip pim ssm command in Global Configuration mode toadministratively configure PIM source specific multicast range of addressesfor IP multicast routing. Use the no form of this command to removeconfigured ranges of addresses from the router.Syntaxip pim ssm {default | group-address group-mask}no ip pim ssm {default | group-address group-mask}• default—Defines the SSM range access list to 232/8.
