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IGMP/VLAN Configuration Screen
Layer 3 Extensions Menu Screens 9-5
Query Interval
(Modifiable)
See or change the query interval time. If the switch is the querier, the
value in the Query Interval field indicates how often IGMP Host-Query
frames are transmitted on the VLAN selected in the VLAN ID field.
This value is also used in calculations for other timers. The default
value is 125 seconds. The range of possible entries is 1 to 300 seconds.
An entry outside of the range will cause the error message
“PERMISSIBLE RANGE: 1...300” to display in the Event Message
field. The field will initially display an asterisk (*).
Query Response
Time
(Modifiable)
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. The field will initially display an asterisk (*).
Interface
Robustness
(Modifiable)
Tune 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 also used in
calculations for other timers. The default value is 2. The field will
initially display an asterisk (*).
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.
Last Member Query
Interval
(Modifiable)
Modify the leave latency of the network.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 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. The field will initially display an asterisk (*).
Table 9-2 IGMP/VLAN Configuration Screen Field Descriptions (Continued)
Use this field… To…