2-5
z The VLAN to be configured as a multicast VLAN must exist.
z A port can belong to only one multicast VLAN.
Displaying and Maintaining Multicast VLAN
To do… Use the command… Remarks
Display information about a
multicast VLAN
display multicast-vlan
[ vlan-id ]
Available in any view
Multicast VLAN Configuration Examples
Network requirements
z As shown in Figure 3-3, Router A connects to a multicast source (Source) through GigabitEthernet
1/0/1, and to Switch A through GigabitEthernet 1/0/2.
z IGMPv2 is required on Router A. IGMPv2 Snooping is required on Switch A. Router A acts as the
IGMP querier.
z Switch A’s GigabitEthernet 1/0/1 belongs to VLAN 10, GigabitEthernet 1/0/2 through
GigabitEthernet 1/0/4 belong to VLAN 2 through VLAN 4 respectively, and Host A through Host C
are attached to GigabitEthernet 1/0/2 through GigabitEthernet 1/0/4 of Switch A respectively.
z The multicast source sends multicast data to multicast group 224.1.1.1. Host A, Host B, and Host C
are receivers of the multicast group.
z Configure the port-based multicast VLAN feature so that Router A just sends multicast data to
Switch A through the multicast VLAN and Switch A forwards the multicast data to the receivers that
belong to different user VLANs.
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