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Configuration Guide - IP Multicast

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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(Optional) Configuring the MLD Snooping Querier

(Optional) Configuring the MLD Snooping Querier

Context

When MLD snooping is enabled on a Layer 2 device, the device can listen to MLD messages exchanged between an MLD querier and user hosts to dynamically create Layer 2 multicast forwarding entries.

A Layer 2 device cannot create Layer 2 multicast forwarding entries by listening to MLD messages in the following situations even when MLD snooping is enabled:

  • MLD messages from the upstream Layer 3 device cannot reach the Layer 2 device.

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

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

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

    By default, the MLD snooping querier is disabled.

    NOTE:
    • If IPv6 Layer 3 multicast functions such as MLD and IPv6 PIM are enabled on a VLANIF interface, the MLD snooping querier cannot be enabled in the corresponding VLAN.

    • After MLD snooping querier is enabled, the switch periodically broadcasts MLD Query messages to all the interfaces in the VLAN, including router ports. This may result in MLD querier reelection if an MLD querier already exists on the multicast network. In this case, configuring MLD snooping querier is not recommended. If MLD snooping querier needs to be configured, ensure that the IPv6 address in MLD General Query messages sent by the switch is larger than that of the upstream MLD querier.

    • The MLD snooping querier and MLD snooping proxy cannot be enabled in the same VLAN.

  4. (Optional) Run mld snooping querier-election

    The MLD snooping querier election function is enabled.

    By default, the MLD snooping querier election function is disabled.

    If the querier function is enabled on multiple devices in the same VLAN, the MLD snooping querier election function needs to be enabled. One of these devices is elected as the querier and sends Query messages to user hosts in place of the upstream router.

  5. (Optional) Set querier parameters.

    NOTE:

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

    Parameter

    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 memberships in a VLAN.

    125 seconds

    MLDv1, MLDv2

    MLD robustness variable

    mld snooping robust-count robust-count

    The robustness variable determines the following values:
    • Number of times the querier sends General Query messages after startup: The message sending interval is one fourth of the configured interval for sending General Query messages.
    • Number of times the querier sends Group-Specific Query messages after receiving a Leave message: The message 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 query max-response-time max-response-time

    After receiving an MLD Report message, the switch sets the aging time of member interface using the following formula:

    Aging time = 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 MLD Group-Specific Query messages

    mld snooping query last-member-interval last-member-interval

    When receiving a Done message from a user host, the switch sets the aging time of member interface using the following formula:

    Aging time = Interval for sending Group-Specific messages x MLD robustness variable

    That is, the switch continuously sends Group-Specific messages for the number of times specified by the MLD robustness variable. This parameter specifies the interval for sending Group-Specific Query messages.

    1 second

    MLDv2

  6. Run quit

    Return to the system view.

  7. (Optional) Run mld snooping send-query source-address ipv6-address

    The source IPv6 address of MLD General Query messages is configured.

    By default, the source IPv6 address of MLD General Query messages sent by the MLD snooping 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.

  8. Run commit

    The configuration is committed.

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Updated: 2019-04-20

Document ID: EDOC1100074724

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