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Configuration Guide - IP Multicast

S7700 and S9700 V200R010C00

This document describes IP multicast basics and how to configure IP multicast features, including IGMP/MLD, PIM (IPv4&IPv6), MSDP, multicast VPN, Layer 3 multicast CAC, Layer 2 multicast CAC, IGMP/MLD snooping, and multicast VLAN, IPv4&IPv6 multicast route management, static multicast MAC address, multicast network.
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Enabling MLD

Enabling MLD

Context

IPv6 multicast routing is the prerequisite for configuring all IPv6 multicast functions. You must enable IPv6 multicast routing before configuring an IPv6 multicast protocol.

Before configuring Multicast Listener Discovery (MLD) on a multicast switch, enable MLD on an interface connected to receiver hosts.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. (Optional) Run:

    set multicast forwarding-table super-mode

    The high specification mode is configured for multicast forwarding.

    In large-scale multicast applications, the switch generates a large number of MLD group entries. When the number of MLD group entries reaches the default limit, new MLD group entries cannot be generated. The high specification mode increases the number of MLD group entries supported on the switch. After this mode is configured, the number of MLD group entries can reach the maximum number supported by the switch, maximizing the switch's capability to support large-scale multicast applications.

    NOTE:
    • The configuration of high specification mode takes effect after a restart.

    • After the high specification mode is configured, the default value of the robustness variable changes from 2 to 3.

  3. Run:

    multicast ipv6 routing-enable

    IPv6 multicast routing is enabled.

  4. Run:

    interface interface-type interface-number

    The interface view is displayed.

  5. (Optional) 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.

  6. Run:

    mld enable

    MLD is enabled on the interface.

    By default, MLD is disabled on an interface.

    NOTE:

    If PIM (IPv6) and MLD need to be enabled on the same interface, enable PIM (IPv6) and MLD in sequence.

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Updated: 2019-08-21

Document ID: EDOC1000141903

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