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NE40E V800R010C10SPC500 Configuration Guide - IP Multicast 01

This is NE40E V800R010C10SPC500 Configuration Guide - IP Multicast
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Configuring an MLD Querier

Configuring an MLD Querier

To configure an MLD querier, you can configure the MLD prompt leave function and set the following parameters: interval at which general query messages are sent, robustness variable, maximum response time of Query messages, keepalive time of other MLD queriers, and interval MLD last-listener query messages are sent.

Usage Scenario

Interfaces that connect multicast devices to the same user network segment must have the same MLD parameter configurations; otherwise, these multicast devices fail to communicate.

An MLD querier is responsible for periodically sending MLD Query messages on a shared network segment to update group memberships. You can configure parameters of an MLD querier either globally or on an interface.

  • Global configuration: takes effect on all interfaces.
  • Interface-specific configuration: takes precedence over the global configuration. If an interface-specific configuration is not available, the interface uses the global configuration.
NOTE:

During the configuration, ensure that the interval for sending general query messages is greater than the maximum response time of Query messages but smaller than the keepalive time of other MLD queriers.

Pre-configuration Tasks

Before configuring an MLD querier, complete the following tasks:

Procedure

  • Configure an MLD querier globally.
    1. Run system-view

      The system view is displayed.

    2. Run mld

      The MLD view is displayed.

    3. Run timer query interval

      The interval at which the device sends general query messages is set.

    4. Run robust-count robust-value

      An MLD robustness variable is set.

      When the router starts, the router sends general query messages for the number of robust-value times. The sending interval is 1/4 of the interval for sending MLD general query messages.

      After receiving a Done message, the router sends last-listener query messages for the number of robust-value times. The sending interval is set by using the lastlistener-queryinterval command.

    5. Run max-response-time interval

      The maximum response time of MLD Query messages is set.

    6. Run timer other-querier-present interval

      The keepalive time of other MLD queriers is set.

    7. Run lastlistener-queryinterval interval

      The interval at which the device sends MLD last-listener query messages is set.

    8. Run commit

      The configuration is committed.

  • Configure an MLD querier on an interface.
    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run mld timer query interval

      The interval at which the interface sends general query messages is set.

    4. Run mld max-response-time interval

      The maximum response time of MLD Query messages is set.

    5. Run mld timer other-querier-present interval

      The keepalive time of other MLD queriers is set.

    6. Run mld robust-count robust-value

      An MLD robustness variable is set.

    7. Run mld lastlistener-queryinterval interval

      The interval at which the interface sends MLD last-listener query messages is set.

    8. Run mld prompt-leave [ group-policy { basic-acl6-number | acl6-name acl6-name } ]

      The MLD prompt leave function is configured on the interface.

    9. Run commit

      The configuration is committed.

Checking the Configurations

Run the display mld interface verbose command to view the configurations and operating status of MLD on an interface.

<HUAWEI> display mld interface verbose
Interface information
 GigabitEthernet1/0/0(FE80::2E0:B4FF:FE35:FF01):
   MLD is enabled
   Current MLD version is 2
   MLD state: up
   MLD group policy: none
   Value of query interval for MLD (negotiated): 125 s
   Value of query interval for MLD (configured): 125 s
   Value of other querier timeout for MLD: 0 s
   Value of maximum query response time for MLD: 10 s
   Value of last listener query time: 2 s
   Value of last listener query interval: 1 s
   Value of startup query interval: 31 s
   Value of startup query count: 2
   General query timer expiry (hours:minutes:seconds): 00:00:28
   Querier for MLD: FE80::2E0:B4FF:FE35:FF01 (this router)
   MLD activity: 0 joins, 0 dones
   Robustness (negotiated): 2
   Robustness (configured): 2
   Require-router-alert: disabled
   Send-router-alert: enabled
   Prompt-leave: disabled
   SSM-Mapping: disabled
   Startup-query-timer-expiry: on
   Other-querier-present-timer-expiry: off
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Updated: 2019-01-03

Document ID: EDOC1100055017

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