EnGenius EWS Series User Manual page 124

VLAN Settings
Use the IGMP Snooping VLAN Settings to configure IGMP Snooping settings for VLANs on the system.
The Switch performs IGMP Snooping on VLANs that send IGMP packets. You can specify the VLANs that
IGMP Snooping should be performed on. Choose from the drop down box whether to enable or disable
IGMP Snooping. Next, choose to enable or disable Fast Leave for the VLAN ID.
VLAN ID
IGMP Snooping Status
Fast Leave
Click the Apply button
If Fast Leave is not used, a multicast querier will send a GS-query message when an IGMPv2/v3 group
leave message is received. The querier stops forwarding traffic for that group only if no host replies to
the query within the specified timeout period. If Fast Leave is enabled, the Switch assumes that only one
host is connected to the port. Therefore, Fast Leave should only be enabled on a port if it is connected to
only one IGMP-enabled device.
Fast Leave is supported only with IGMPv2 or IGMPv3 Snooping when IGMP Snooping is enabled. Fast
Leave does not apply to a port if the Switch has learned that a multicast querier is attached to it.
Fast Leave can improve bandwidth usage for a network which frequently experiences many IGMP host
add and leave requests.
Displays the VLAN ID.
Enables or disables the IGMP Snooping feature for the specified VLAN ID.
Enables or disables the IGMP Snooping Fast Leave for the specified VLAN
ID. Enabling this feature allows the Switch to immediately remove the
Layer 2 LAN port from its forwarding table entry upon receiving an IGMP
leave message without first sending out IGMPgroup-specific (GS) queries
to the port.
to accept the changes or the Cancel button to discard them.
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