Owner's manual

Chapter 4 - Conguration Management

ASUS GigaX2124

4.8.6 IGMP snooping

IGMP snooping helps reduce the multicast trafcs on the network by allow-

ing the IGMP snooping function to be turned on or off.

The rst part provides the following settings.

Enable IGMP Snooping

: Globally enable IGMP snooping in all

existing VLAN interfaces. By default, IGMP snooping is globally

disabled on the switch. When globally enabled or disabled, it is also

enabled or disabled in all existing VLAN interfaces.

If global snooping is disabled, you cannot enable VLAN snooping. If global

snooping is enabled, you can enable or disable VLAN snooping.

Last Member Query Interval: Without Immediate Leave, when

the switch receives an IGMP leave message from a subscriber on

a receiver port, it sends out an IGMP query on that port and waits

for IGMP group membership reports. If no reports are received in a

congured time period, the receiver port is removed from multicast

group membership.

The second part provides the following settings.

Status

: If global snooping is enabled, you can enable or disable

VLAN snooping.

Immediate leave: When you enable IGMP Immediate-Leave

processing, the switch immediately removes a port when it detects

an IGMP version 2 leave message on that port. You should use the

Immediate-Leave feature only when there is a single host present on

every port in the VLAN. Immediate Leave is supported with only IGMP

version 2 hosts.

(However, if the static entries occupy all 256 spaces, the IGMP snoop does

not work normally. The switch only allows 256-layer 2 multicast groups.)

Click

to make the settings effective. Click

Reload

to refresh the

settings to current value.