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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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(Optional) Configuring a Static MLD Multicast Group on an Interface

(Optional) Configuring a Static MLD Multicast Group on an Interface


In some scenarios such as when:

  • Stable multicast members exist on the network, so that fast and stable multicast data forwarding is required.

  • Hosts require multicast data but cannot send Multicast Listener Report messages.

You can configure a static multicast group on the user-side interface of a switch. After a static multicast group is configured on the interface, the switch considers that multicast group members exist on the network segment to which the interface belongs. Therefore, the switch always forwards multicast data sent to the multicast group.


  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 static-group ipv6-group-address [ inc-step-mask ipv6-group-mask-length number group-number ] [ source ipv6-source-address ]

    One or more static multicast groups are configured on the interface.

    By default, no static multicast group is configured on an interface.


    If a static Multicast Listener Discovery (MLD) group is configured on a loopback interface, the switch forwards multicast data to this group only when users request the data, which reduces traffic on the network. If a static MLD group is configured on other MLD-capable interfaces, the switch forwards multicast data to the group immediately after receiving the data. For example, you can configure static multicast groups on a loopback interface if users may request data of these groups but have not requested the data at present. If some multicast groups have stable receivers on a network segment, you can configure the static multicast groups on the interface connected to this network segment.

  5. Run commit

    The configuration is committed.

Updated: 2019-04-20

Document ID: EDOC1100074724

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