# Multicast basic settings

### 1. Summary

This page is for basic settings related to multicast.
Specify processing method for unknown multicast frames.

Unknown multicast frames are frames destined to addresses not registered in IGMP snooping.
This product forwards unknown multicast frames to all ports as the default setting, which does not matter in low bandwidth environments. However, discarding instead of forwarding in high bandwidth environments may be recommended.
If you want to discard unknown multicast frames and only forward some multicast frames that use link local addresses such as mDNS, you can exclude them from discarding.

### 2. Top page

This is the top page for multicast basic settings.

#### 2.1. System settings

- Displays the configuration for unknown multicast frames for the entire system.

- The table items are explained below.

  - Processing method for unknown multicast frames

    - Displays the processing method of unknown multicast frames.

  - Excluded frames from discarding (for all VLANs)

    - Displays excluded frames from discarding when configured to discard unknown multicast frames.

- Press the "Setting" button to access a page where you can change the settings.

#### 2.2. VLAN interface settings

- Displays the configuration for unknown multicast frames for each VLAN.

- The table items are explained below.

  - VLAN ID

    - VLAN ID is displayed.

  - Unknown multicast frame

    - Displays the processing method for unknown multicast frames for the target VLAN.

  - Excluded frames from discarding

    - Displays the frames to be excluded from discarding when unknown multicast frames are configured to be discarded in the target VLAN.

- Press the "Setting" button to access a page where you can change the settings of the selected VLAN.

- Press the "Specify all" button to configure the settings for all VLAN interfaces with the check box selected.

- Press the "Return to defaults" button to initialize the settings for all VLAN interfaces with the check box selected.

### 3. System settings page

This page is for configuring unknown multicast frames for the entire system.
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. System settings

- Processing method for unknown multicast frames

  - Specify the processing method for unknown multicast frames from below.

    - Flood

    - Discard

- Excluded frames from discarding (for all VLANs)

  - Specify the excluded frames from discarding when configured to discard unknown multicast frames.

  - Specify the following conditions for excluded frames from discarding.

    - Link local address

      - Set all addresses in 224.0.0.0/24 and ff02::/112 as the target.

      - This setting is for all VLANs.

      - This setting is not included in the number of configurable settings for the entire system.

### 4. VLAN Interface settings page

This page is for configuring unknown multicast frames for a VLAN interface.
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.

#### 4.1. VLAN interface settings

- VLAN ID

  - Displays the VLAN ID for which the setting is to be changed.

- Processing method for unknown multicast frames

  - Specify the processing method for unknown multicast frames from below.

    - Follow the system setting

    - Prefer the interface setting

      - Flood

      - Discard

- Excluded frames from discarding

  - Specify the excluded frames from discarding when configured to discard unknown multicast frames.

  - Specify the following conditions for excluded frames from discarding.

    - Destination address

      - Specify the address type from the following.

        - Specify the address

          - Enter the IPv4 multicast address into the text box.

        - mDNS

          - Set 224.0.0.251 as the target.

        - Dante

          - Set 224.0.0.230 - 233 as the target.

        - PTP

          - Set 224.0.1.129 - 132 and 239.254.3.3 as the target.

    - Press the icon to add a new row.

    - Press the "Delete" button to delete the row.

    - You can specify up to 100 addresses to be excluded from the discarding for the entire system.

      - If specifying Dante as the address type, one item is counted as four items.

      - If specifying PTP as the address type, one item is counted as five items.

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