142 CHAPTER 16: MULTICAST CONFIGURATION GUIDE
vlan 100
igmp-snooping enable
igmp-snooping querier
#
interface Ethernet1/0/1
port access vlan 100
#
interface Ethernet1/0/2
port access vlan 100
#
Configuration on Switch B
#
unknown-multicast drop enable
#
igmp-snooping enable
#
vlan 100
igmp-snooping enable
#
interface Ethernet1/0/1
port access vlan 100
#
interface Ethernet1/0/2
port access vlan 100
#
interface Ethernet1/0/3
port access vlan 100
#
Configuration on Switch C
#
igmp-snooping enable
#
vlan 100
igmp-snooping enable
#
interface Ethernet1/0/1
port access vlan 100
#
interface Ethernet1/0/2
port access vlan 100
#
interface Ethernet1/0/3
port access vlan 100
#
Configuring Multicast VLAN

In the traditional multicast-on-demand mode, when users in different VLANs on a

Layer 2 device need multicast information, the multicast router needs to forward a

separate copy of the multicast data to each of these VLANs. This mode wastes a

great deal of bandwidth.

With the multicast VLAN feature, you can configure a VLAN as the multicast

VLAN, which can be used to transmit multicast traffic to users in different VLANs.