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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 Join/Leave messages sent from downstream devices.

Context

A Layer 3 multicast device on a multicast network running IGMP acts as an IGMP querier, sending IGMP 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 situations:
  • IGMP 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.

Procedure

  1. Run system-view

    The system view is displayed.

  2. Perform either of the following operations to select VLAN or VPLS networking:

    • 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 igmp-snooping enable

    IGMP snooping is enabled for the VLAN or VSI.

  4. Run igmp-snooping querier enable

    The querier function is enabled.

    By default, the querier function is disabled.

  5. Run igmp-snooping querier-election

    One of these devices is elected as the querier to send Query messages to user hosts.

    By default, no device is enabled with the querier function.

    If the querier function is enabled on multiple devices in the VSI or VLAN, one of these devices must be elected as the querier to send Query messages to user hosts.

  6. (Optional) Set querier parameters.

    NOTE:

    An IGMPv1 host does not send a Leave message when leaving a multicast group. Therefore, the igmp-snooping lastmember-queryinterval command is valid only when IGMPv2 messages can be processed in the VLAN or VSI.

    • Run igmp-snooping query-interval query-interval

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

      By default, a querier sends general query messages at an interval of 60s.

      NOTE:

      The default interval value in this command is 60s, which is different than the default value (125s) defined by the relevant standard. A Huawei querier and a non-Huawei querier must send IGMP general query messages at the same interval.

    • Run igmp-snooping robust-count robust-count

      The number of times a group-specific query message is sent is set.

      By default, a group-specific query message is sent twice.

    • Run igmp-snooping max-response-time max-response-time

      The maximum time for a downstream host to respond to a querier is set.

      By default, the maximum time for a downstream host to respond to a querier is 10s.

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

    • Run igmp-snooping lastmember-queryinterval lastmember-queryinterval

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

      By default, a querier sends group-specific query messages or source/group-specific query messages every 1s.

  7. Run commit

    The configuration is committed.

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Updated: 2019-01-03

Document ID: EDOC1100055017

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