Configuring Igmp Report Suppression; Configuring Maximum Multicast Groups That Can Be Joined On A Port - 3Com 4510G Configuration Manual

To do...
Enable the function of dropping
unknown multicast data

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...
Enter system view
Enter IGMP Snooping view
Enable IGMP report
suppression

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...
Enter system view
Enter Ethernet port/Layer 2
aggregate port view or port
group view
Configure the maximum
number of multicast groups
allowed on the port(s)
Use the command...
igmp-snooping
drop-unknown
Use the command...
system-view
igmp-snooping
report-aggregation
Use the command...
system-view
interface interface-type
interface-number
port-group manual
port-group-name
igmp-snooping group-limit
limit [ vlan vlan-list ]
2-16
Remarks
Required
Disabled by default
Remarks
—
—
Optional
Enabled by default
Remarks
—
Required
Use either approach
Optional
By default, the maximum
number of multicast groups
allowed on the port(s) is 1000.