2-10Suppressing Flooding of Unknown Multicast Traffic in a VLANWith IGMP Snooping enabled in a VLAN, multicast traffic for unknown multicast groups is flooded withinthe VLAN by default. This wastes network bandwidth and affects multicast forwarding efficiency.With the unknown multicast flooding suppression function enabled, when receiving a multicast packetfor an unknown multicast group, an IGMP Snooping switch creates a nonflooding entry and relays thepacket to router ports only, instead of flooding the packet within the VLAN. If the switch has no routerports, it drops the multicast packet.Table 2-12 Suppress flooding of unknown multicast traffic in the VLANOperation Command RemarksEnter system view system-view —Enable unknown multicastflooding suppressionigmp-snoopingnonflooding-enableRequiredBy default, unknown multicastflooding suppressionIf the function of dropping unknown multicast packets is enabled, you cannot enable unknown multicastflooding suppression.Configuring Static Member Port for a Multicast GroupIf the host connected to a port is interested in the multicast data for a specific group, you can configurethat port as a static member port for that multicast group.In Ethernet port viewTable 2-13 Configure a static multicast group member port in Ethernet port viewOperation Command RemarksEnter system view system-view —Enter Ethernet port view interface interface-typeinterface-number —Configure the current port as astatic member port for amulticast group in a VLANmulticast static-groupgroup-address vlan vlan-idRequiredBy default, no port is configuredas a static multicast groupmember port.In VLAN interface viewTable 2-14 Configure a static multicast group member port in VLAN interface viewOperation Command RemarksEnter system view system-view —
