1-17Any multicast data that has failed the ACL check will not be sent to this port. In this way, the serviceprovider can control the VOD programs provided for multicast users.Configuring a multicast group filter globallyFollow these steps to configure a multicast group filter globally:To do... Use the command... RemarksEnter system view system-view —Enter IGMP Snooping view igmp-snooping —Configure a multicast groupfiltergroup-policy acl-number[ vlan vlan-list ]RequiredNo group filter is configured bydefault.Configuring a multicast group filter on a port or a group of portsFollow these steps to configure a multicast group filter on a port or a group of ports:To do... Use the command... RemarksEnter system view system-view —interface interface-typeinterface-numberEnter Ethernet interface/Layer2 aggregate interface view orport group view port-group manualport-group-nameRequiredUse either approachConfigure a multicast groupfilterigmp-snooping group-policyacl-number [ vlan vlan-list ]RequiredNo group filter is configured bydefault.If the specified ACL does not exist or the ACL rule is null, all multicast groups will be filtered out.Configuring the Function of Dropping Unknown Multicast DataUnknown multicast data refers to multicast data for which no entries exist in the IGMP Snoopingforwarding table. When receiving such multicast traffic, the switch floods it in the VLAN, incurringnetwork bandwidth waste and low forwarding efficiency.With the function of dropping unknown multicast data enabled, the switch forwards unknown multicastdata to its router ports instead of flooding it in the VLAN. If no router ports exist, the switch drops theunknown multicast dataFollow these steps to configure the function of dropping unknown multicast data in a VLAN:To do... Use the command... RemarksEnter system view system-view —Enter VLAN view vlan vlan-id —
