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4 Configuration D-Link Smart Managed Switch User Manual
48
Query Interval (60-600 sec): The Query Interval is the interval between General Queries sent. By adjusting
the Query Interval, the number of IGMP messages can be increased or decreased; larger values will cause
IGMP Queries to be sent less often. Default value is 125 seconds.
Router Timeout (60-600 sec): This is the interval after which a learned router port entry will be purged. For
each router port learned, a 'Router Port Purge Timer' runs for 'Router Port Purge Interval'. This timer will be
restarted whenever a Query control message is received over that port. If there are no Query control
messages received for 'Router Port Purge Interval' time, the learned router port entry will be purged. Default
is 260 seconds.
Last Member Query Interval (1-25 sec): The Last Member Query Interval is the Max Response Time
inserted into Group-Specific Queries sent in response to Leave Group messages, and is also the amount of
time between Group-Specific Query messages. This value may be adjusted to modify the "leave latency" of
the network. A reduced value results in reduced time to detect the loss of the last member of a group. Default
is 1 second.
Max Response Time (10-25 sec): The Max Response Time specifies the maximum allowed time before
sending a responding report message. Adjusting this setting effects the "leave latency", or the time between
the moment the last host leaves a group and when the multicast server is notified that there are no more
members. It also allows adjustments for controlling the frequency of IGMP traffic on a subnet. Default is 10
seconds.
To enable IGMP snooping for a given VLAN, select enable and click on the Apply button. Then press the
VLAN ID number, and select the ports to be assigned as router ports for IGMP snooping for the VLAN, and
press Apply for changes to take effect. A router port configured manually is a Static Router Port, and a
Dynamic Router Port is dynamically configured by the Switch when query control message is received.
Figure 4.55 – L2 Functions > Multicast > IGMP Snooping VLAN Settings
State: Specify the State to be enabled or disabled.
Querier State: D-Link Smart Switch is able to send out the IGMP Queries to check the status of multicast
clients. Default is disabled.
Fast Leave: Specify the Fast Leave feature to be enabled or disabled.
To view the Multicast Entry Table for a given VLAN, press the View button.
Figure 4.56 – L2 Functions > Multicast > IGMP Multicast Entry Table
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