Discarding Unknown Multicast Flows
Context
Unknown multicast flows are those that do not match any entry in the multicast forwarding table or match multicast forwarding entries with an empty outbound interface list. These flows are not requested by users. The switch broadcasts unknown IPv6 multicast flows in the corresponding VLAN. If a switch broadcasts unknown multicast flows in a VLAN, you can configure the switch to drop unknown multicast flows, reducing instant bandwidth usage.
Procedure
- Run system-view
The system view is displayed.
- Run vlan vlan-id
The VLAN view is displayed.
- Run multicast drop-unknown
The switch is configured to discard unknown multicast flows.
The multicast drop-unknown command configures the switch to discard all unknown IPv4 and IPv6 multicast packets, including the protocol packets that are transparently transmitted within the VLAN and use the reserved multicast address.