210
DCS-3950 series Ethernet switch manual
SwitchB (config)#vlan 100
SwitchB (config-vlan100)#switchport access ethernet 0/0/15
SwitchB (config-vlan100)exit
SwitchB#config
SwitchB (config)#vlan 101
SwitchB (config-vlan101)#switchport access ethernet 0/0/20
SwitchB (config-vlan101)exit
SwitchB (config)# interface ethernet 0/0/10
SwitchB (Config-Ethernet0/0/10)#switchport mode trunk
SwitchB (Config-Ethernet0/0/10)#exit
SwitchB (config)#vlan 20
SwitchB (config-vlan20)#multicast-vlan
SwitchB (config-vlan20)#multicast-vlan association 100,101
SwitchB (config-vlan20)#exit
SwitchB (config)#ip igmp snooping
SwitchB (config)#ip igmp snooping vlan 20