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Ensure there is a vlan configured as a L2 general querier, or there is a static mrouter configured in a
segment,
Use command to check if the MLD snooping information is correct
45.1 Introductions to Multicast VLAN
Based on current multicast order method, when orders from users in different VLAN, each VLAN will copy a
multicast traffic in this VLAN, which is a great waste of the bandwidth. By configuration of the multicast VLAN,
we add the switch port to the multicast VLAN, with the IGMP Snooping/MLD Snooping functions enabled,
users from different VLA N will s hare the same multicast VLAN. The multicast traffic only exists within a
multicast VLAN, so the bandwidth is saved. As the multicast VLAN is absolutely separated from the user
VLAN, security and bandwidt h concerns can be met at the same time, after the multicast VLAN is configured,
the multicast traffic will be continuously sent to the users.
45.2 Multicast VLAN Configuration Task List
1． Enable the multicast VLAN function
2． Configure the IGMP Snooping
3． Configure the MLD Snooping
1. Enable the multicast VLAN function
VLAN configuration mode
multicast-vlan
no multicast-vlan
multicast-vlan association <vlan-li st>
no multicast-vlan association <vlan-li st>
2. Configure the IGMP Snooping
Global Mode
ip igmp snooping vlan <vlan-id>
no ip igmp snooping vlan <vlan-id>
ip igmp snooping
no ip igmp snooping
Chapter 45 Multicast VLAN
Command
Command
Explanation
Configure a VLAN and enable the multicast VLAN
on it. The "no multica st-vlan" command disables
the multicast function on the VLA N.
Associate a multicast VLAN with several VLANs.
The "no" form of this command deletes the related
VLANs associated with the multicast VLAN.
Explanation
Enable the IGMP Snooping function on the
multicast VLAN. The "no" form of this command
disables the IGMP Snooping on the multicast
VLAN.
Enable the IGMP Snooping function. The "no" form
of this command disables the IGMP snooping
function.
45-33
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