Operation Manual – MulticastH3C S3100 Series Ethernet Switches Chapter 2 IGMP Snooping Configuration2-10Note:z A port can belong to multiple VLANs, you can configure only one ACL rule per VLANon a port.z If no ACL rule is configured, all the multicast groups will be filtered.z Since most devices broadcast unknown multicast packets by default, this function isoften used together with the function of dropping unknown multicast packets toprevent multicast streams from being broadcast as unknown multicast packets to aport blocked by this function.z The configuration performed in system view takes effect on all ports of the switch ifno VLAN is specified; if one or more VLANs are specified, the configuration takeseffect on all ports in the specified VLAN(s).z The configuration performed in Ethernet port view takes effect on the port no matterwhich VLAN it belongs to if no VLAN is specified; if one or more VLANs are specified,the configuration takes effect on the port only if the port belongs to the specifiedVLAN(s).2.2.6 Configuring the Maximum Number of Multicast Groups on a PortBy configuring the maximum number of multicast groups that can be joined on a port,you can limit the number of multicast programs on-demand available to users, thus toregulate traffic on the port.Table 2-10 Configure the maximum number of multicast groups on a portOperation Command RemarksEnter system view system-view —Enter Ethernet port view interface interface-typeinterface-number —Configure the maximumnumber of multicastgroups allowed on theportigmp-snoopinggroup-limit limit [ vlanvlan-list[ overflow-replace ] ]RequiredFor the S3100-SI series,the system default is 256.For the S3100-EI series,the system default is 512.
