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NE40E V800R010C10SPC500 Configuration Guide - IP Multicast 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Multicast
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Configuring the Querier Function

Configuring the Querier Function

The querier function enables a device to send Query messages for its upstream device and respond to Multicast Listener Discovery (MLD) messages sent from downstream devices.


There is an MLD-capable Layer 3 multicast device acting as a querier on a multicast network. The querier sends MLD Query messages to create and maintain multicast forwarding entries for normal multicast data forwarding.

The querier function, however, cannot be implemented on a Layer 3 device in either of the following conditions:
  • MLD messages sent from the Layer 3 device cannot reach a downstream Layer 2 device.
  • Multicast forwarding entries on the Layer 3 device are statically configured and do not need to be dynamically learned.

To solve these issues, configure the querier function on the Layer 2 device so that it can create and maintain multicast forwarding entries at the data link layer, ensuring normal multicast data forwarding. The querier parameters can be set as required.


  1. Run system-view

    The system view is displayed.

  2. Perform either of the following operations based on the VLAN or VPLS networking scenario:

    • Run the vlan vlan-id command to enter the VLAN view.
    • Run the vsi vsi-name [ static ] command to enter the VSI view.

  3. Run mld-snooping enable

    MLD snooping is enabled for the VLAN or VSI.

  4. Run mld-snooping querier enable

    The querier function is enabled.

  5. (Optional) Run mld-snooping querier-election

    The querier election function is enabled, so that the device can participate in querier election.

    If the querier function is enabled on multiple devices in a VSI or VLAN, querier election needs to be enabled. The elected querier is used to send Query messages to user hosts.

  6. (Optional) Set querier parameters.

    • Run mld-snooping query-interval query-interval

      The interval at which a querier sends general Query messages is set.

    • Run mld-snooping robust-count robust-count

      The number of group-specific Query messages to be sent is set.

    • Run mld-snooping max-response-time max-response-time

      The maximum time for a querier to wait for responses from downstream hosts is set.

      The maximum wait time must be shorter than the interval at which general Query messages are sent.

    • Run mld-snooping lastmember-queryinterval lastmember-queryinterval

      The interval at which a querier sends group-specific Query messages or source-and group-specific Query messages is set.

  7. Run commit

    The configuration is committed.

Updated: 2019-01-03

Document ID: EDOC1100055017

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