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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 IGMP On-Demand

Configuring IGMP On-Demand


In a standard IGMP working process, the querier periodically sends Query messages and collects group membership information based on Report and Leave messages sent from hosts. If group members on a network seldom change, you can configure IGMP on-demand on the querier. IGMP on-demand enables the querier to maintain group memberships based on hosts' requirements, without sending Query messages. This function reduces the number of IGMP messages exchanged between the querier and hosts, conserving bandwidth on the network.

After you configure IGMP on-demand on an interface of the switch:

  • The interface no longer sends IGMP Query messages.
  • The switch creates IGMP group entries after receiving IGMP Report messages. The entries will never age out.
  • The switch deletes a group entry immediately after receiving an IGMP Leave message for the group.

IGMP on-demand applies only to IGMPv2 and IGMPv3.


  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 igmp on-demand

    IGMP on-demand is enabled on the interface. The interface no longer sends IGMP Query messages, and IGMP group entries on the interface will never age out.

    By default, an interface periodically sends Query messages and participates in querier election.


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

  5. Run commit

    The configuration is committed.

Updated: 2019-04-20

Document ID: EDOC1100074724

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