Operation Manual – MulticastH3C S7500 Series Ethernet Switches Chapter 6 IGMP Configuration6-96.2.3 Configuring IGMP Multicast Groups on the InterfaceYou can perform the following configurations on the interface for the IGMP multicastgroups:z Limit the number of multicast groups on the interfacez Limit the range of multicast groups that the interface servesI. Limit the number of multicast groups on the interfaceIf the number of IGMP groups on the multicast routing interface of the switch is notlimited, the memory of the switch may be used out and the routing interface of theswitch may fail when plenty of multicast groups join in the routing interface.You can configure limit on the number of IGMP multicast groups on the interface of theswitch. Thus, when users are ordering the programs of multicast groups, the networkbandwidth can be controlled because the number of multicast groups is limited.II. Limit the range of multicast groups that the interface servesThe Layer 3 switch determines the membership of the network segment throughtranslating the received IGMP join messages. You can configure a filter for eachinterface to limit the range of multicast groups that the interface serves.Follow these steps to configure IGMP multicast groups on the interface:To do... Use the command... RemarksEnter system view system-view —Enable the multicastrouting protocolmulticastrouting-enableEnable the multicastrouting protocol.Enter VLAN interface view interface Vlan-interfaceinterface-number —Enable IGMP on thecurrent interface igmp enableBy default, if the IPmulticast routing protocolis enabled globally, IGMPis enabled on all thelayer-3 interfacesautomatically.Configure limit on thenumber of IGMP groupson the interfaceigmp group-limit limitRequiredBy default, the number ofmulticast groups joining aVLAN interface is 256.
