Asus GigaX2124 - Manual (Page 50)

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Chapter 4 - Configuration Management
ASUS GigaX2124
4.8.6 IGMP snooping
IGMP snooping helps reduce the multicast traffics on the network by allow-
ing the IGMP snooping function to be turned on or off.
The first 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
configured 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 OK to make the settings effective. Click Reload to refresh the
settings to current value.