Enterasys Networks 2H253, 2E253 Query Interval, Query Response, Robustness, Last Member Query

IGMP/VLAN Configuration Screen

Table 9-2 IGMP/VLAN Configuration Screen Field Descriptions (Continued)

Use this field…	To…
Query Interval	See or change the query interval time. If the switch is the querier, the
(Modifiable)	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	Enter the maximum query response time advertised in IGMPv2 general
Time	queries on this VLAN. This value is used in calculations for other
(Modifiable)	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	Tune the expected frame loss on a subnet. If a subnet is expected to be
Robustness	high loss, the Robustness Variable may be increased. IGMP is robust to
(Modifiable)	(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	Modify the leave latency of the network.The Last Member Query
Interval	Interval is the Max Response Time inserted into Group-Specific
(Modifiable)	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 (*).

Layer 3 Extensions Menu Screens 9-5