2-16
To do... Use the command... Remarks
Enable the function of dropping
unknown multicast data
igmp-snooping
drop-unknown
Required
Disabled by default
Configuring IGMP Report Suppression
When a Layer 2 device receives an IGMP report from a multicast group member, the device forwards
the message to the Layer 3 device directly connected with it. Thus, when multiple members of a
multicast group are attached to the Layer 2 device, the Layer 3 device directly connected with it will
receive duplicate IGMP reports from these members.
With the IGMP report suppression function enabled, within each query cycle, the Layer 2 device
forwards only the first IGMP report per multicast group to the Layer 3 device and will not forward the
subsequent IGMP reports from the same multicast group to the Layer 3 device. This helps reduce the
number of packets being transmitted over the network.
Follow these steps to configure IGMP report suppression:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter IGMP Snooping view
igmp-snooping
—
Enable IGMP report
suppression
report-aggregation
Optional
Enabled by default
Configuring Maximum Multicast Groups that Can Be Joined on a Port
By configuring the maximum number of multicast groups that can be joined on a port, you can limit the
number of multicast programs on-demand available to users, thus to regulate traffic on the port.
Follow these steps to configure the maximum number of multicast groups allowed on a port or ports:
To do... Use the command... Remarks
Enter system view
system-view
—
interface interface-type
interface-number
Enter Ethernet port/Layer 2
aggregate port view or port
group view
port-group manual
port-group-name
Required
Use either approach
Configure the maximum
number of multicast groups
allowed on the port(s)
igmp-snooping group-limit
limit [ vlan vlan-list ]
Optional
By default, the maximum
number of multicast groups
allowed on the port(s) is 1000.
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