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 pagewhere you can change the IGMP snooping function settings for theselected 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 boxcontains a check mark
- Default settings for the IGMP snooping function are as follows
  - IGMP snooping function: Disabled
  - 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 receivingterminals and a multicast router. It can suppress the flooding ofmulticast 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 querytransmission function is enabled. The transmission interval can bespecified 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 queryas the multicast router port. Also, you can statically configure themulticast router port.
- To statically configure multicast routerports, press the "Select" button. The interfaces that belong to thespecified 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 causesmulticast frames to be transferred to the multicast router port as wellif any port is receiving IGMP report messages.
  - Enable
    
    Enabling this function causesmulticast frames to be transferred to the multicast router port as wellonly 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 informationincluded in the LLDP Basic Management TLV is used to judge whether aswitch is connected to the port or not.
- Select from the following items.
  - Enable
    
    Enabling this function transfersreceived IGMP report and leave messages to the multicast router portsand 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.
    
    If you check the "Disable on ports where a switch is conneced" check box, the fast leave function will not be used on ports where the switch is connected.