H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 333)

29-15
When enabled to filter IPv4 multicast data based on the source ports, the device is automatically
enabled to filter IPv6 multicast data based on the source ports.
Configuring the Function of Dropping Unknown Multicast Data
Unknown multicast data refers to multicast data for which no entries exist in the IGMP Snooping
forwarding table. When the switch receives such multicast traffic:
z
With the function of dropping unknown multicast data enabled, the switch drops all the unknown
multicast data received.
z
With the function of dropping unknown multicast data disabled, the switch floods unknown
multicast data in the VLAN which the unknown multicast data belongs to.
Follow these steps to configure the function of dropping unknown multicast data in a VLAN:
To do... Use the command... Remarks
Enter system view system-view —
Enter VLAN view vlan vlan-id —
Enable the function of dropping
unknown multicast data
igmp-snooping drop-unknown
Required
Disabled by default
When enabled to drop unknown IPv4 multicast data, the device is automatically enabled to drop
unknown IPv6 multicast data.
Configuring IGMP Report Suppression
When a Layer 2 device receives an IGMP report from a multicast group member, the device forwards
the message to the Layer 3 device directly connected with it. Thus, when multiple members of a
multicast group are attached to the Layer 2 device, the Layer 3 device directly connected with it will
receive duplicate IGMP reports from these members.
With the IGMP report suppression function enabled, within each query cycle, the Layer 2 device
forwards only the first IGMP report per multicast group to the Layer 3 device and will not forward the
subsequent IGMP reports from the same multicast group to the Layer 3 device. This helps reduce the
number of packets being transmitted over the network.
Follow these steps to configure IGMP report suppression: