Enabling dropping unknown multicast data
Unknown multicast data refers to multicast data for which no forwarding entries exist in the IGMP snooping forwarding table. This feature enables the device only to forward unknown multicast data to the router port. If the device does not have a router port, unknown multicast data will be dropped.
If you do not enable this feature, the unknown multicast data is flooded in the VLAN to which the data belongs.
To enable dropping unknown multicast data in a VLAN or VSI:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter VLAN view or VSI view. |
| N/A |
3. Enable dropping unknown multicast data for the VLAN or VSI. | igmp-snooping drop-unknown | By default, dropping unknown multicast data is disabled, and unknown multicast data is flooded. |