Configuring A Vlan Tag For Query Messages; Configuring Multicast Vlan - H3C S3100-52P Operation Manual

Operation Manual – Multicast
H3C S3100-52P Ethernet Switch

3.2.12 Configuring a VLAN Tag for Query Messages

By configuring the VLAN tag carried in IGMP general and group-specific queries
forwarded and sent by IGMP Snooping switches, you can enable multicast packet
forwarding between different VLANs In a Layer-2 multicast network environment.
Follow these steps to configure VLAN tag for query message:
Enter system view
Configure a VLAN tag
for query messages
Note:
It is not recommended to configure this function while the multicast VLAN function is in
effect.

3.2.13 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:
Enter system view
Create a multicast VLAN
and enter VLAN view
Return to system view
To do... Use the command...
system-view
igmp-snooping
vlan-mapping vlan
vlan-id
To do...
system-view
vlan vlan-id
quit
Chapter 3 IGMP Snooping Configuration
Use the command...
3-16
Remarks
—
Required
By default, the VLAN tag in
IGMP general and
group-specific query
messages is not changed.
Remarks
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—
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