Configuring Multicast Vlan - H3C S3100 Series Operation Manual

It is not recommended to configure this function while the multicast VLAN function is in effect.

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.
Table 2-18 Configure multicast VLAN on the Layer 3 switch
Operation
Enter system view
Create a multicast VLAN and enter
VLAN view
Return to system view
Enter VLAN interface view
Enable IGMP
Return to system view
Enter Ethernet port view for the
Layer 2 switch to be configured
Define the port as a trunk or hybrid
port
Specify the VLANs to be allowed to
pass the Ethernet port
Table 2-19 Configure multicast VLAN on the Layer 2 switch
Operation
Enter system view
Command
system-view
vlan vlan-id
quit
interface Vlan-interface vlan-id
igmp enable
quit
interface interface-type interface-number
port link-type { trunk | hybrid }
port hybrid vlan vlan-id-list { tagged |
untagged }
port trunk permit vlan vlan-list
Command
system-view
2-14
Remarks
—
—
—
—
Required
By default, the IGMP feature
is disabled.
—
—
Required
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.
Remarks
—