606 CHAPTER 44: MULTICAST VLAN CONFIGURATION
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■ The VLAN to be configured as the multicast VLAN and the VLANs to be
configured as sub-VLANs of the multicast VLAN must exist.
■ The number of sub-VLANs of the multicast VLAN must not exceed the
system-defined limit (an Switch 4800G supports a maximum of one multicast
VLAN and 127 sub-VLANs).
c
CAUTION:
■ You cannot configure any multicast VLAN or a sub-VLAN of a multicast VLAN
on a device with IP multicast routing or routing enabled.
■ After a VLAN is configured into a multicast VLAN, IGMP Snooping must be
enabled in the VLAN before the multicast VLAN feature can be implemented,
while it is not necessary to enable IGMP Snooping in the sub-VLANs of the
multicast VLAN.
Displaying and
Maintaining Multicast
VLAN
Multicast VLAN
Configuration
Example
Network requirements
■ Router A connects to a multicast source through GigabitEthernet 1/0/2 and to
Switch A, through GigabitEthernet 1/0/1.
■ IGMP is required on Router A, and IGMP Snooping is required on Switch A.
Router A is the IGMP querier.
■ Switch A’s GigabitEthernet 1/0/1 belongs to VLAN 1024, GigabitEthernet 1/0/2
through GigabitEthernet 1/0/4 belong to VLAN 11 through VLAN 13
respectively, and Host A through Host C are attached to GigabitEthernet 1/0/2
through GigabitEthernet 1/0/4 of Switch A.
■ Configure the multicast VLAN feature so that Router A just sends multicast
data to VLAN 1024 rather than to each VLAN when the three hosts attached to
Switch A need the multicast data.
Configure a specific VLAN as
a multicast VLAN
multicast-vlan vlan-id
enable
Required
Disabled by default
Configure sub-VLANs for a
specific multicast VLAN
multicast-vlan vlan-id
subvlan vlan-list
Required
No sub-VLAN by default.
To do… Use the command… Remarks
To do… Use the command… Remarks
Display information about a
multicast VLAN and its
sub-VLANs
display multicast-vlan
[ vlan-id ]
Available in any view
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