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Discarding of Unknown Multicast Flows
Context
Unknown multicast flows are multicast data flows that match no entry in the multicast forwarding table. By default, the router broadcasts unknown multicast flows in the corresponding VLAN. Enabling the discarding of unknown multicast flows reduces instant bandwidth usage compared with the broadcast mode.
- Only the SRU-100H and SRU-200H support the function.
- Only the AR6140-16G4XG and AR6140H-S support the function.
Procedure
- Run system-view
The system view is displayed.
- Run vlan vlan-id
The VLAN view is displayed.
- Run multicast drop-unknown
The router is configured to discard unknown multicast flows.
By default, the router broadcasts unknown multicast flows in a VLAN.
After the multicast drop-unknown command is run, the router discards all unknown multicast packets, including the protocol packets that are transparently transmitted within the VLAN and use the reserved multicast address.