Local Management: Overview, Setup, and Navigation
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IGMP/VLAN Configuration Screen Fields
The following information briefly explains each IGMP/VLAN Configuration
Screen field.
IGMP Version (Toggle)
This field displays the current configured IGMP version running on the VLAN
selected in the VLAN ID field. The default is version 2. The IGMP Version field
can be toggled to configure the switch in either version 1 or 2 to match the router
configuration. For IGMP to function correctly, all switches on a LAN must be
configured to run the same version of IGMP. All VLANs available to the module
will be affected if ALL is chosen as the option under VLAN ID. The field will
initially display an asterisk (*) if the VLAN ID is set to ALL, then it can be toggled
using the Space Bar.
Query Interval (Modifiable)
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 (*) if the VLAN ID is set to ALL, then it will be modifiable.
Query Response Time (Modifiable)
This field is the maximum query response time advertised in IGMPv2 general
queries on this VLAN. This value is also 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 (*) if the VLAN ID is set to ALL, then it will be
modifiable.
Interface Robustness (Modifiable)
This field 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 also used in
calculations for other timers. The default value is 2. The field will initially display
an asterisk (*) if the VLAN ID is set to ALL, then it will be modifiable.