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To do... Use the command... Remarks
Configure a multicast group filter
igmp-snooping group-policy acl-
number [ vlan vlan-list ]
Required
By default, no group filter is
configured on the current port.
That is, the hosts on this port can
join any valid multicast group.
Configuring multicast source port filtering
When the multicast source port filtering feature is enabled on a port, the port can connect to only
multicast receivers rather than to multicast sources, because the port blocks all multicast data packets but
it permits multicast protocol packets to pass.
If this feature is disabled on a port, the port can connect to 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 —
Enter Ethernet interface view or
port group view
interface interface-type interface-
number
Required
Use either approach
port-group manual port-group-
name
Enable multicast source port
filtering
igmp-snooping source-deny
Required
Disabled by default
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 the switch receives such multicast traffic, one of the following occurs:
• When the function of dropping unknown multicast data is disabled, the switch floods unknown
multicast data in the VLAN that the unknown multicast data belongs to, causing network bandwidth
waste and low forwarding efficiency.
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