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Configuration Guide - IP Multicast

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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Configuring MLD On-Demand

Configuring MLD On-Demand


In a standard Multicast Listener Discovery (MLD) working process, a querier periodically sends Query messages and receives Multicast Listener Report and Done messages from the receiver hosts to learn information about multicast members. If group members on a network seldom change, you can configure MLD on-demand on the querier. After MLD on-demand is configured on the querier, the querier does not send Query messages, reducing MLD packets exchanged between the querier and receiver hosts. The querier maintains multicast membership according to requirements of receiver hosts without actively sending Query messages.

After MLD on-demand is configured, the switch:

  • Does not send MLD Query messages through the interface.
  • Generate MLD group entries that will never age out after receiving Multicast Listener Report messages.
  • Delete MLD group entries immediately when receiving Multicast Listener Done messages.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The interface view is displayed.

  3. On an Ethernet interface, run undo portswitch

    The interface is switched to Layer 3 mode.

    By default, an Ethernet interface works in Layer 2 mode.

    The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.


    If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

  4. Run mld on-demand

    MLD on-demand is enabled on the interface. The interface then does not send MLD Query messages and MLD group entries on the interface are never aged.

    By default, a querier does not maintain group memberships according to requirements of group members, and dynamic entries are aged out when the aging time expires.


    The querier does not process dynamic MLD entries that have been generated before MLD on-demand is enabled on it.

  5. Run commit

    The configuration is committed.

Updated: 2019-04-20

Document ID: EDOC1100074724

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