Trendnet TEG240WS User Manual

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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 increase or decrease; larger values 
cause IGMP Queries to be sent less often. Default is 125 seconds. 
Max Response Time (10-25 sec): The Max Response Time specifies 
the maximum allowed time before sending a responding report. 
Adjusting this setting effects the "leave latency", or the time between 
the moment the last host leaves a group and when the routing protocol 
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. 
Robustness Variable (1-255): The Robustness Variable allows 
adjustment for the expected packet loss on a subnet. If a subnet is 
expected to be lousy, the Robustness Variable may be increased. The 
Robustness Variable cannot be set zero, and SHOULD NOT be one. 
Default is 2 times. 
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. 
Host Timeout (130-1225 sec): This is the interval after which a learnt 
host port entry will be purged. For each host port learnt, a 
'PortPurgeTimer' runs for 'HostPortPurgeInterval'. This timer will be 
restarted whenever a report message from host is received over that 
port. If no report messages are received for 'HostPortPurgeInterval' 
time, the learnt host entry will be purged from the multicast group. 
Default is 260 seconds. 
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