3Com Switch 4800G 24-Port Configuration Manual page 567

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Configuring the
Function of Dropping
Unknown Multicast
Data
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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...
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 the Enter Ethernet
corresponding port view
view
Enter port group
view
Enable multicast source port filtering
When enabled to filter IPv4 multicast data based on the source ports, the device is
automatically enabled to filter IPv6 multicast data based on the source ports.
Unknown multicast data refers to multicast data for which no entries exist in the
IGMP Snooping forwarding table. When the switch receives such multicast traffic:
With the function of dropping unknown multicast data enabled, the switch
■
drops all the unknown multicast data received.
With the function of dropping unknown multicast data disabled, the switch
■
floods unknown multicast data in the VLAN which the unknown multicast data
belongs to.
Follow these steps to configure the function of dropping unknown multicast data
in a VLAN:
To do...
Enter system view
Enter VLAN view
Enable the function of
dropping unknown multicast
data
When enabled to drop unknown IPv4 multicast data, the device is automatically
enabled to drop unknown IPv6 multicast data.
Configuring an IGMP Snooping Policy
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 |
aggregation agg-id }
igmp-snooping
source-deny
Use the command...
system-view
vlan vlan-id
igmp-snooping
drop-unknown
567
Remarks
-
-
Required
Disabled by default
Remarks
-
Use either command
Required
Disabled by default
Remarks
-
-
Required
Disabled by default