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Configuring Multicast VLAN
In traditional multicast implementations, when users in different VLANs listen to the same multicast
group, the multicast data is copied on the multicast router for each VLAN that contains receivers. This is
a big waste of network bandwidth.
In an IGMP Snooping environment, by configuring a multicast VLAN and adding ports to the multicast
VLAN, you can allow users in different VLANs to share the same multicast VLAN. This saves bandwidth
because multicast streams are transmitted only within the multicast VLAN. In addition, because the
multicast VLAN is isolated from user VLANs, this method also enhances the information security.
Multicast VLAN is mainly used in Layer 2 switching, but you must make the corresponding
configurations on the Layer 3 switch.
Follow these steps to configure multicast VLAN on the Layer 3 switch:
To do... Use the command... Remarks
Enter system view
system-view
—
Create a multicast VLAN and
enter VLAN view
vlan vlan-id
—
Return to system view
quit
—
Enter VLAN interface view
interface Vlan-interface
vlan-id
—
Enable IGMP
igmp enable
Required
By default, the IGMP feature is
disabled.
Return to system view
quit
—
Enter Ethernet port view for the
Layer 2 switch to be configured
interface interface-type
interface-number
—
Define the port as a trunk or
hybrid port
port link-type { trunk |
hybrid }
Required
port hybrid vlan vlan-id-list
{ tagged | untagged }
Specify the VLANs to be
allowed to pass the Ethernet
port
port trunk permit vlan vlan-list
Required
The multicast VLAN defined on
the Layer 2 switch must be
included, and the port must be
configured to forward tagged
packets for the multicast VLAN
if the port type is hybrid.
Follow these steps to configure multicast VLAN on the Layer 2 switch:
To do... Use the command... Remarks
Enter system view
system-view
—
Enable IGMP Snooping
igmp-snooping enable
—
Enter VLAN view
vlan vlan-id
—
Enable IGMP Snooping
igmp-snooping enable
Required
Enable multicast VLAN
service-type multicast
Required
Return to system view
quit
—