Motorola WiNG 5.6 Reference Manual page 166

5 - 80 WiNG 5.6 Access Point System Reference Guide
6. Set the following for
Enable IGMP Querier
IGMP Version
IGMP Query Interval
IGMP Robustness
Variable
Maximum Response Time
Other Querier Time Expiry
7. Select the OK
configuration.
IGMP Querier configuration:
Select this option to enable IGMP querier. IGMP snoop querier is used to keep host
memberships alive. It is primarily used in a network where there is a multicast streaming
server and hosts subscribed to the server and no IGMP querier present. The controller can
perform the IGMP querier role. An IGMP querier sends out periodic IGMP query packets.
Interested hosts reply with an IGMP report packet. IGMP snooping is only conducted on
wireless radios. IGMP multicast packets are flooded on wired ports. IGMP multicast
packet are not flooded on the wired port. IGMP membership is also learnt on it and only
if present, then forwarded on that port. An AP71xx model access point can also be an
IGMP querier.
Use the spinner control to set the IGMP version compatibility to IGMP version 1, 2 or 3.
The default IGMP version is 3.
Sets the IGMP query interval. This parameter is used only when the querier functionality
is enabled. Define an interval value in Seconds (1 - 18000 seconds), Minutes (1 - 300
minutes) or Hours (1 - 5 hours) up to maximum of 5 hours. The default value is 60 seconds.
Sets the IGMP robustness variable. The robustness variable is a way of indicating how
susceptible the subnet is to lost packets. IGMP can recover from robustness variable
minus 1 lost IGMP packets. Define a robustness variable from 1 - 7. The default
robustness value is 2.
Specify the maximum time (from 1 - 25 seconds) before sending a responding report.
When no reports are received from a radio, radio information is removed from the IGMP
snooping table. The access point only forwards multicast packets to radios present in the
snooping table. For IGMP reports from wired ports, the controller forwards these reports
to the multicast router ports. The default setting is 10 seconds.
Specify an interval in either Seconds (60 - 300) or Minutes (1 - 5) to set a timeout interval
for other querier resources. The default setting is 1 minute.
button located at the bottom right of the screen to save the changes. Select Reset to revert to the last saved