Configuring The Function Of Dropping Unknown Multicast Data - 3Com 4500G Family Configuration Manual

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...
Enter system view
Enter IGMP Snooping view
Enable multicast source port
filtering
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...
Enter system view
Enter Ethernet port view
or port group view
Enable multicast source
port filtering
3Com Switch 4500G 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...
Enter system view
Enter VLAN view
Use the command...
system-view
igmp-snooping
source-deny port interface-list
Use the command...
system-view
interface interface-type
interface-number
port-group manual port-group-name
igmp-snooping source-deny
Use the command...
system-view
vlan vlan-id
1-15
Remarks
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—
Required
Disabled by default
Remarks
—
Required
Use either approach
Required
Disabled by default
Remarks
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