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CLI-based Configuration Guide - IP Multicast

AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R007

This document describes the principles and configurations of IP multicast, and provides configuration examples.
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(Optional) Configuring the MLD Snooping Querier

(Optional) Configuring the MLD Snooping Querier

Context

When Multicast Listener Discovery (MLD) snooping is enabled on a Layer 2 device, the device can listen to MLD protocol packets exchanged between an MLD querier and user hosts to dynamically create Layer 2 multicast forwarding entries and provide Layer 2 multicast functions.

A Layer 2 device cannot create Layer 2 multicast forwarding entries by listening to MLD protocol packets in the following conditions, even when MLD snooping is enabled:

  • The interfaces on the upstream Layer 3 multicast device have static multicast groups configured and do not run the MLD protocol.

  • The multicast source is located on the same Layer 2 network as user hosts, and therefore no Layer 3 multicast device is required.

In either of the preceding conditions, you can configure the MLD snooping querier on the Layer 2 multicast device. Then the Layer 2 multicast device sends MLD Query messages to user hosts in place of the upstream Layer 3 device.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    vlan vlan-id

    The VLAN view is displayed.

  3. Run:

    mld-snooping querier enable

    The MLD snooping querier is enabled.

    NOTE:
    • After MLD snooping querier is enabled, the router periodically broadcasts MLD Query messages to all the interfaces in a VLAN, including the router ports. This may result in MLD querier reelection if an MLD querier already exists on the multicast network. If an MLD querier already exists on the multicast network, configuring MLD snooping querier is not recommended. If MLD snooping querier needs to be configured in this condition, ensure that the router has a larger IP address than the upstream MLD querier.

  4. (Optional) Set the querier parameters.

    NOTE:

    Ensure that the interval for sending MLD General Query messages is longer than the maximum response time for MLD Query messages.

    Querier Parameter

    Configuration Command

    Description

    Default Setting

    Version

    Interval for sending MLD General Query messages

    mld-snooping query-interval query-interval

    The querier sends MLD General Query messages at the specified interval to maintain group memberships in a VLAN.

    60 seconds

    MLDv1, MLDv2

    MLD robustness variable

    mld-snooping robust-count robust-count

    The robustness variable defines the following values:
    • Number of times the querier sends General Query messages after startup. The packet sending interval is 1/4 of the configured interval for sending General Query messages.
    • Number of times the querier sends Group-Specific Query messages after receiving a Done message. The packet sending interval is the same as the configured interval for sending Group-Specific Query messages.

    2

    MLDv1, MLDv2

    Maximum response time for MLD Query messages

    mld-snooping max-response-time max-response-time

    After receiving an MLD Report message, the router sets the aging time of member port to: Interval for sending General-Query messages x MLD robustness variable + Maximum response time.

    After a multicast member receives an MLD Query message, it must send a Report message within the maximum response time.

    10 seconds

    MLDv2

    Interval for sending Last Member Query messages

    mld-snooping last-listener-query-interval query-interval

    When receiving a Done message from a user host, the router sets the aging time of member port to: Interval for sending Group-Specific messages x MLD robustness variable. That is, the router continuously sends Group-Specific messages for "MLD robustness variable" times. This parameter specifies the interval for sending Last Member Query messages.

    1 second

    MLDv2

  5. (Optional) Run:

    quit

    Return to the system view.

  6. (Optional) Run:

    mld-snooping send-query source-address ipv6-address

    The source IPv6 address of the MLD General Query message is configured.

    By default, the source IPv6 address of MLD General Query messages on an MLD querier is FE80::. If the specified address is being used by another device on the network, run this command to change the source IPv6 address.

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Updated: 2019-06-12

Document ID: EDOC1000097181

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