1-8Table 1-4 Configuration items for advanced IGMP snooping featuresItem DescriptionPortSelect the port on which advanced IGMP snooping features are to be configured.The port can be an Ethernet port or Layer-2 aggregate port.After a port is selected, advanced features configured on this port are displayedat the lower part of this page.Advanced IGMP snooping features configured on a Layer 2 aggregate port donot interfere with features configured on its member ports, nor do they take part inaggregation calculations; features configured on a member port of the aggregategroup will not take effect until it leaves the aggregate groupVLAN IDSpecify a VLAN in which you can configure the fast leave function for the port orthe maximum number of multicast groups allowed on the port.Configurations made in a VLAN take effect for the ports in this VLAN only.Group LimitConfigure the maximum number of multicast groups that the port can join.With this feature, you can regulate multicast traffic on the port.When the number of multicast groups a port has joined reaches the configuredthreshold, the system deletes all the forwarding entries persistent on that portfrom the IGMP snooping forwarding table, and the hosts on this port need to jointhe multicast groups again.Fast LeaveEnable or disable the fast leave function for the port.With the fast leave function enabled on a port, the switch, when receiving anIGMP leave message on the port, immediately deletes that port from the outgoingport list of the corresponding forwarding table entry. Then, when receiving IGMPgroup-specific queries for that multicast group, the switch will not forward them tothat port. In VLANs where only one host is attached to each port, the fast leavefunction helps improve bandwidth and resource usage.If fast leave is enabled for a port to which more than one host is attached, whenone host leaves a multicast group, the other hosts listening to the same multicastgroup will fail to receive multicast data.Return to IGMP snooping configuration task list.Display IGMP Snooping Multicast Entry InformationSelect Network > IGMP Snooping in the navigation tree to enter the basic configuration page shown inFigure 1-3. Click the plus sign (+) in front of Show Entries to display information about IGMP snoopingmulticast entries, as shown in Figure 1-6. You can view the detailed information of an entry by click theicon corresponding to the entry.Figure 1-6 Display entry information
