3Com Switch 8800 Configuration Guide Chapter 24 IGMP Snooping Configuration24-7Caution:If IGMP snooping is not enabled on the VLAN (nor Layer 3 multicast), unknownmulticast packets are broadcasted within the VLAN no matter whether this function isenabled or not. That is, to make unknown multicast packets not be broadcasted with aVLAN, you must enable igmp-snooping in this VLAN and enable igmp-snoopingnonflooding-enable globally.Perform the following configuration in system view.Table 24-5 Globally enable/disable multicast packets not broadcasted within a VLANOperation CommandEnable multicast packets not to bebroadcasted within a VLAN igmp-snooping nonflooding-enableDisable multicast packets not to bebroadcasted within a VLANundo igmp-snoopingnonflooding-enableBy default, unknown multicast packets are broadcasted within the VLAN.24.3 Displaying and debugging IGMP SnoopingAfter the above configuration, execute display command in any view to display therunning of the IGMP Snooping configuration, and to verify the effect of theconfiguration.Table 24-6 Displaying and debugging IGMP SnoopingOperation CommandDisplay the information about current IGMPSnooping configurationdisplay igmp-snoopingconfigurationDisplay IGMP Snooping statistics ofreceived and sent messages display igmp-snooping statisticsDisplay IP/MAC multicast group informationin the VLANdisplay igmp-snooping group[ vlan vlanid ]24.4 IGMP Snooping Configuration Example24.4.1 Enable IGMP SnoopingI. Networking requirements
