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Chapter 1: Changes to Local Management Screens
1-48 Local Management Supplement
Query Response Time (Modifiable)
Used to enter the maximum query response time advertised in IGMPv2
general queries on this VLAN. This value is used in calculations for other
timers. The default value is 10 seconds. The range of possible entries is 1
to 300 seconds. The value entered in this field cannot be bigger than the
Query Interval.
Interface Robustness (Modifiable)
Allows tuning for the expected frame loss on a subnet. If a subnet is
expected to be high loss, the Robustness Variable may be increased.
IGMP is robust to (Robustness Variable-1) packet losses. This value is
used in calculations for other timers. The default value is 2.
Last Member Query Interval (Modifiable)
Displays the Max Response Time inserted into Group-Specific Queries
sent in response to the Leave Group messages, and is also the amount of
time between Group-Specific Query messages. This value may be tuned
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. The interval
is in tenths of seconds. This value is not used if the switch is not the
querier.
Querier Address (Read-Only)
Displays the address of the IGMP Querier on the IP subnet to which this
VLAN is attached.
Querier Uptime (Read-Only)
Displays the number of seconds that the current IGMP Querier has been
operational since the last change in Queriers.
Querier Expire Time (Read-Only)
The number of seconds remaining before the Other Querier Present Timer
expires. If the local system (current device displayed) is the querier, the
value of this object is zero.
TIP
If the Interface Robustness is adjusted higher than the default
value, depending on the network, this may be an indication of
problems with the network that need to be resolved.