# IGMP snooping

### 1. Summary

In this page you can edit the settings of the IGMP snooping function.

### 2. Top page

This is the top page for IGMP snooping.

#### 2.1. IGMP snooping function settings

- IGMP snooping function 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 IGMP snooping function 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 IGMP snooping function are as follows

    - IGMP snooping function: Enabled

    - IGMP version: IGMPv3

    - IGMP query: No transmission

    - IGMP query transmission interval: 125 seconds

    - TTL check: Enabled

    - RA check : Disabled

    - ToS check : Disabled

    - Multicast router port : None

    - Data transfer suppression function for multicast router ports : Disabled

    - Report suppression function : Enabled

    - Report forwarding function : Disabled

    - Fast leave function : Disabled

### 3. IGMP snooping function settings page

In this page you can make various settings for the IGMP snooping function.
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. IGMP snooping function settings

- VLAN ID

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

- IGMP snooping settings

  - Enabled ( Control transmission of IP multicast packets )

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

  - Disabled ( Flood IP multicast packets )

    - Disable IGMP snooping
      Multicast packets are always forwarded to all ports in the same VLAN.

- Version

  - Select the IGMP version from the following items.

    - IGMPv3

    - IGMPv2

- IGMP query

  - No transmission
    IGMP query transmission function is disabled

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

- TTL check

  Select the TTL check from the following items.

  - Enabled ( IGMP packets other than TTL=1 are discarded )

  - Disabled ( IGMP packets other than TTL=1 are corrected to TTL=1 and transmitted )

- RA check

  Select the RA check from the following items.

  - Disabled ( RA option is added to IGMP packets and transmitted )

  - Enabled ( IGMP packets without a RA option are discarded )

- ToS check

  Select the ToS check from the following items.

  - Disabled ( ToS is corrected to 0xc0 in IGMP packets and transmitted )

  - Enabled ( IGMP packets with invalid ToS are discarded )

- Multicast router port

  - The multicast router port is the interface to which the multicast router is connected.
    This device automatically learns the interface that receives the IGMP 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.

- Data transfer suppression function for multicast router ports

  - This function suppresses network traffic load by stopping unnecessary multicast frames transfer to the multicast router port.

  - Select from the following items.

    - Disable

      - Disabling this function causes multicast frames to be transferred to the multicast router port as well if any port is receiving IGMP report messages.

    - Enable

      - Enabling this function causes multicast frames to be transferred to the multicast router port as well only when the multicast router port receives IGMP report messages.

- 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 IGMP report and leave messages to the IGMP querier at once.

    - Disable

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

- Report forwarding function

  - This function transfers IGMP report and leave messages to the port where a switch is connected in the same VLAN.

  - The System Capabilities information included in the LLDP Basic Management TLV is used to judge whether a switch is connected to the port or not.

  - Select from the following items.

    - Enable

      - Enabling this function transfers received IGMP report and leave messages to the multicast router ports and the ports where a switch is connected.

    - Disable

      - Disabling this function transfers received IGMP report and leave messages to the multicast router ports only.

- Fast leave function

  - Fast leave function is a function not to check the receiver’s existence in the IGMP 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 IGMP leave process sends a group-specific query to check the receivers' existence.

    - Enable

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

      - When the "Disable on ports where a switch is connected" is checked, the fast leave function is not used on the port where a switch is connected.

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