You can issue the ip igmp version 3 command and either the ip pim sparse-mode command or the ip pim sparse-dense-mode command on each interface. Source Specific Multicast (SSM) enables a device to specify the source addresses from which it will accept multicast traffic. Internet Group Management Protocol version 3 (IGMPv3) improves upon IGMPv2 by adding support for SSM; therefore, IGMPv3 is required for SSM to function. You can enable IGMPv3 on an interface by issuing the ip igmp version 3command. IGMPv2 does not support SSM; therefore, you cannot issue the ip igmp version 2 command on an SSM interface.

SSM is derived from Protocol Independent Multicast sparse mode (PIMSM). Therefore, PIM-SM and PIM sparse dense mode (PIM-SDM) are the only modes that can be used with SSM. You can enable PIM-SM on an interface by issuing the ip pim sparse mode command, and you can enable PIM-SDM on an interface by issuing the ip pim sparse dense mode command. You cannot use PIM dense mode (PIM-DM) or PIM passive mode with SSM; therefore, you should not issue the ip pim dense mode command or the ip pim passive command on an SSM interface.