H3C Technologies H3C S3100 Series Switches - Manual (Page 301)

2-14
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 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.
Table 2-19 Configure multicast VLAN on the Layer 2 switch
Operation Command Remarks
Enter system view system-view —