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CLI-based Configuration Guide - IP Multicast

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the basic concepts, configuration procedures, and configuration examples of the interfaces supported by the device.
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Discarding of Unknown Multicast Flows

Discarding of Unknown Multicast Flows


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.


AR2204-24GE, AR2204-27GE, AR2204-27GE-P, AR2204-48GE-P, AR2204-51GE, AR2204-51GE-P, AR2204-51GE-R, AR2204E, AR2204E-D, AR2204XE, AR2204XE-DC, AR2220L, AR2220E and AR2240C do not support this function.


  1. Run system-view

    The system view is displayed.

  2. Run vlan vlan-id

    The VLAN view is displayed.

  3. Run multicast drop-unknown

    The router is configured to discard unknown multicast flows.


    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.

Updated: 2019-03-06

Document ID: EDOC1100069332

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