# MLD snooping

### 1. Summary

In this page you can edit the settings of the MLD snooping.

### 2. Top page

This is the top page for MLD snooping.

#### 2.1. MLD snooping settings

- MLD snooping settings are shown for each VLAN ID that is defined.

- A maximum of 20 items can be displayed for one page. Press or or enter a numeric value to switch between pages.

- When you press the "Setting" button, a page where you can change the MLD snooping settings for the selected VLAN ID will appear.

- If you press the "Specify all" button, the settings can be changed for all VLAN IDs whose check box contains a check mark.

- If you press the "Return to defaults" button, the settings will be initialized for all VLAN IDs whose check box contains a check mark.

  - Default settings for the MLD snooping are as follows.

    - MLD snooping : Disabled

    - Version : MLDv2

    - MLD query : No transmission

    - MLD query transmission interval : 125 Seconds

    - Multicast router port : None

    - Report suppression function : Enabled

    - Fast leave function : Disabled

### 3. MLD snooping settings page

In this page you can make various settings for the MLD snooping.
Enter the settings, and then press the "Confirm" button.
If there are no mistakes in the input content of the confirmation screen, press the "OK" button.

#### 3.1. MLD snooping settings

- VLAN ID

  - The VLAN ID for which settings are being made is shown.

- MLD snooping

  - Enabled ( Control transmission of IPv6 multicast packets )

    - Enable MLD snooping
      Multicast packets are forwarded only to the port to which the terminal you want to receive them is connected.
      This function monitors (snoops) MLD messages exchanged between receiving terminals and a multicast router. It can suppress the flooding of multicast packets and reduce network bandwidth usage.

  - Disabled ( Flood IPv6 multicast packets )

    - Disables the MLD snooping
      Multicast packets are always forwarded to all ports in the same VLAN.

- Version

  - Select the MLD version from the following items.

    - MLDv1

    - MLDv2

- MLD query

  - No transmission
    MLD query transmission function is disabled.

  - Transmit periodically
    MLD query transmission function is enabled. The transmission interval can be specified in the range of 20 seconds to 18000 seconds.

- Multicast router port

  - The multicast router port is the interface used to connect multicast routers.
    This device automatically learns the interface that receives the MLD query as the multicast router port. Also, you can statically configure the multicast router port.

  - To statically configure multicast router ports, press the "Select" button. The interfaces that belong to the specified VLAN ID are listed.
    Then, check the check box of the interface to use as the multicast router port, and press the "Confirm" button.

- Report suppression function

  - This function suppresses the network traffic load between the multicast router and the host.

  - Select from the following items.

    - Enable

      - Enabling this function transfers received MLD report and leave messages to the MLD querier at once.

    - Disable

      - Disabling this function transfers received MLD report and leave messages to the MLD querier as is without combining them.

- Fast leave function

  - Fast leave function is a function not to check the receiver’s existence in the MLD leave process.

  - This function is effective when only one receiver is connected to the LAN/SFP port.

  - Select from the following items.

    - Disable

      - Disable the fast leave function.
        The MLD leave process sends a group-specific query to check the receivers' existence.

    - Enable

      - Enable the fast leave function.
        The MLD leave process does not check the receiver’s existence.

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