Operation Manual – MulticastH3C S5500-EI Series Ethernet Switches Chapter 2 IGMP Snooping Configuration2-17To do... Use the command... RemarksConfigure the source IPaddress of IGMPgroup-specific queriesigmp-snoopingspecial-query source-ip{ current-interface |ip-address }Optional0.0.0.0 by defaultCaution:The source address of IGMP query messages may affect IGMP querier selection withinthe segment.2.6 Configuring an IGMP Snooping Policy2.6.1 Configuration PrerequisitesBefore configuring an IGMP Snooping policy, complete the following task:z Enable IGMP Snooping in the VLAN or enable IGMP on the desired VLANinterfaceBefore configuring an IGMP Snooping policy, prepare the following data:z ACL rule for multicast group filteringz The maximum number of multicast groups that can pass the ports2.6.2 Configuring a Multicast Group FilterOn an IGMP Snooping–enabled switch, the configuration of a multicast group allowsthe service provider to define restrictions on multicast programs available to differentusers.In an actual application, when a user requests a multicast program, the user’s hostinitiates an IGMP report. Upon receiving this report message, the switch checks thereport against the configured ACL rule. If the port on which the report was heard canjoin this multicast group, the switch adds an entry for this port in the IGMP Snoopingforwarding table; otherwise the switch drops this report message. Any multicast datathat 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.
