Configuring IGMP Snooping Only 139
[SwitchA] vlan 100
[SwitchA-vlan100] port Ethernet 1/0/1 Ethernet 1/0/2
[SwitchA-vlan100] igmp-snooping enable
# Enable IGMP Snooping querier in VLAN 100.
[SwitchA-vlan100] igmp-snooping querier
[SwitchA-vlan100] quit
# Enable dropping unknown multicast packets.
[SwitchA] unknown-multicast drop enable
Configuring Switch B
# Enable IGMP Snooping globally.
<SwitchB> system-view
[SwitchB] igmp-snooping enable
Enable IGMP-Snooping ok.
# Create VLAN 100, assign Ethernet 1/0/1 through Ethernet 1/0/3 to VLAN 100,
and enable IGMP Snooping in this VLAN.
[SwitchB] vlan 100
[SwitchB-vlan100] port Ethernet 1/0/1 to Ethernet 1/0/3
[SwitchB-vlan100] igmp-snooping enable
[SwitchB-vlan100] quit
# Enable dropping unknown multicast packets.
[SwitchB] unknown-multicast drop enable
Configuring Switch C
# Enable IGMP Snooping globally.
<SwitchC system-view
[SwitchC] igmp-snooping enable
Enable IGMP-Snooping ok.
# Create VLAN 100, assign Ethernet 1/0/1 through Ethernet 1/0/3 to VLAN 100,
and enable IGMP Snooping in this VLAN.
[SwitchC] vlan 100
[SwitchC-vlan100] port Ethernet 1/0/1 to Ethernet 1/0/3
[SwitchC-vlan100] igmp-snooping enable
cCAUTION: As Switch C is not the IGMP Snooping querier, it cannot create
forwarding entries for Host A and Host B, and therefore, do not enable the
function of dropping unknown multicast packets on Switch C. To avoid impact on
the network and on Switch C caused by multicast flooding, it is recommended to
enable IGMP Snooping querier on the switch to which the multicast source is
directly attached.