Dell M6220 User Configuration Manual page 1264

console(config-if-vlan20)#exit
8 Globally enable IP multicast, IGMP, and PIM-SM on the switch.
console(config)#ip multicast
console(config)#ip igmp
console(config)#ip pim sparse
9 Configure VLAN 10 as the RP and specify the range of multicast groups
for PIM-SM to control. The 239.9.x.x address is chosen as it is a locally
administered address that maps to MAC addresses that do not conflict
with control plane protocols.
console(config)#ip pim rp-address 192.168.10.4 239.9.0.0 255.255.0.0
1264
Managing IPv4 and IPv6 Multicast