Operation Manual – MulticastH3C S5500-EI Series Ethernet Switches Chapter 3 MLD Snooping Configuration3-18To do... Use the command... RemarksEnable IPv6 multicast sourceport filtering mld-snooping source-denyRequiredDisabled bydefaultNote:When enabled to filter IPv6 multicast data based on the source ports, the device isautomatically enabled to filter IPv4 multicast data based on the source ports.3.6.4 Configuring Dropping Unknown IPv6 Multicast DataUnknown IPv6 multicast data refers to IPv6 multicast data for which no forwardingentries exist in the MLD Snooping forwarding table: When the switch receives suchIPv6 multicast traffic:z With the function of dropping unknown IPv6 multicast data enabled, the switchdrops all unknown IPv6 multicast data received.z With the function of dropping unknown IPv6 multicast data disabled, the switchfloods unknown IPv6 multicast data in the VLAN to which the unknown IPv6multicast data belongs.Follow these steps to enable dropping unknown IPv6 multicast data in a VLAN:To do... Use the command... RemarksEnter system view system-view —Enter VLAN view vlan vlan-id —Enable dropping unknownIPv6 multicast datamld-snoopingdrop-unknownRequiredDisabled by defaultNote:When enabled to drop unknown IPv6 multicast data, the device is automaticallyenabled to drop unknown IPv4 multicast data.3.6.5 Configuring MLD Report SuppressionWhen a Layer 2 device receives an MLD report from an IPv6 multicast group member,the Layer 2 device forwards the message to the Layer 3 device directly connected withit. Thus, when multiple members belonging to an IPv6 multicast group exist on the
