3-54 Administrator’s Handbook
•Query Response Interval (deci-sec) – the maximum amount of time in tenths of a second that the IGMP
router waits to receive a response to a General Query message. The default query response inter val is 10
seconds and must be less than the query interval.
•Unsolicited Report Interval(s) – the amount of time in seconds between repetitions of a particular
computer’s initial report of membership in a group. The default unsolicited report inter val is 10 seconds.
•IGMP Querier Version – select a version of the IGMP Querier from the pop-up menu: v1, v2 or v3. If you
know you will be communicating with other hosts that are limited to v1 or v2, for backward compatibility,
select accordingly; otherwise, allow the default v3.
If you have upgraded from earlier software versions, and had previously selected v2, v3 will be the new
default.
Note: IGMP Querier version is relevant only if the router is configured for IGMP forwarding. If any IGMP v1
routers are present on the subnet, the querier must use IGMP v1. The use of IGMP v1 must be administratively
configured, since there is no reliable way of dynamically determining whether IGMP v1 routers are present on a
network. IGMP forwarding is enabled per IP Profile and WAN Connection Profile.
See “Multicast Forwarding” on page 7-32 for more information.
If you chose IGMP Querier Version v2 or v3, select V2/V3 Settings, and press Return.
The IGMP V2/V3 Settings screen appears.
You can configure the following parameters:
•Last Member Query Interval (deci-sec) – the amount of time in tenths of a second that the IGMP router
waits to receive a response to a Group-Specific Query message. The last member query inter val is also the
amount of time in seconds between successive Group-Specific Query messages. The default last member
query interval is 1 second (10 deci-seconds).
IGMP V2/V3 Settings
Last Member Query Interval(deci-sec): 10
Last Member Query Count: 2
Fast Leave: Off
Amount of time in deci-seconds that the IGMP router waits to receive a response