3Com 4210G Series, Configuration Manual

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If this feature is disabled on a port, the port can be connected with both multicast sources and
multicast receivers.
Configuring multicast source port filtering globally
Follow these steps to configure multicast source port filtering globally:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter IGMP Snooping view
igmp-snooping
—
Enable multicast source port
filtering
source-deny port interface-list
Required
Disabled by default
Configuring multicast source port filtering on a port or a group of ports
Follow these steps to configure multicast source port filtering on a port or a group of ports:
To do... Use the command... Remarks
Enter system view
system-view
—
interface interface-type
interface-number
Enter Ethernet port view
or port group view
port-group manual port-group-name
Required
Use either approach
Enable multicast source
port filtering
igmp-snooping source-deny
Required
Disabled by default
For the Switch 4210G Family, when enabled to filter IPv4 multicast data based on the source ports, are
automatically enabled to filter IPv6 multicast data based on the source ports.
Configuring the Function of Dropping Unknown Multicast Data
Unknown multicast data refers to multicast data for which no entries exist in the IGMP Snooping
forwarding table. When receiving such multicast traffic, the switch floods it in the VLAN, incurring
network bandwidth waste and low forwarding efficiency.
With the function of dropping unknown multicast data enabled, the switch forwards unknown multicast
data to its router ports instead of flooding it in the VLAN. If no router ports exist, the switch drops the
unknown multicast data..
Follow these steps to configure the function of dropping unknown multicast data in a VLAN:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter VLAN view
vlan vlan-id
—