Configuring Multicast Vlan - H3C S5100-SI Operation Manual

Operation
Configure a VLAN tag for query
messages
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 2-19 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
Command
igmp-snooping
vlan-mapping vlan vlan-id
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 }
2-13
Remarks
Required
By default, no VLAN tag is
configured for general and
group-specific query messages
sent or forwarded by IGMP
Snooping.
Remarks
—
—
—
—
Required
By default, the IGMP feature is
disabled.
—
—
Required