Motorola Netopia 3397GP Administrator's Handbook page 163

❑ Querier Version – select a version of the IGMP Querier: version 1, version 2, or version 3. If you
know you will be communicating with other hosts that are limited to v1 or v2, for backward compati-
bility, select accordingly; otherwise, allow the default v3.
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NOTE:
IGMP Querier version is relevant only if the Gateway 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.
❑ Last Member Query Interval – the amount of time in tenths of a second that the IGMP gateway
waits to receive a response to a Group-Specific Query message. The last member query interval 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).
❑ Last Member Query Count – the number of Group-Specific Query messages sent before the gate-
way assumes that there are no members of the host group being queried on this interface. The
default last member query count is 2.
❑ Fast Leave – set to off by default, fast leave enables a non-standard expedited leave mechanism.
The querier keeps track of which client is requesting which channel by IP address. When a leave
message is received, the querier can check its internal table to see if there are any more clients on
this group. If there are none, it immediately sends an IGMP leave message to the upstream querier.
❑ Log Enable – If set to on, all IGMP messages on both the LAN and the WAN will be logged.
❑ Wireless Multicast to Unicast conversion – Only available if IGMP Snooping is enabled. If set to
on, the Gateway replaces the multicast MAC-address with the physical MAC-address of the wireless
client. If there is more than one wireless client interested in the same multicast group, the Gateway
will revert to multicasting the stream immediately. When one or more wireless clients leave a group,
and the Gateway determines that only a single wireless client is interested in the stream, it will once
again unicast the stream.
set igmp snooping [ off | on ]
Enables IGMP Snooping.
set igmp robustness value
Sets IGMP robustness range: from 2 – 255. The default is 2.
set igmp query-intvl value
Sets the query-interval range: from 10 seconds – 600 seconds, The default is 125 seconds.
set igmp query-response-intvl value
Sets the query-response interval range: from 5 deci-seconds (tenths of a second) – 255 deci-seconds.
The default is 100 deci-seconds.
set igmp unsol-report-intvl value
Sets the unsolicited report interval: the amount of time in seconds between repetitions of a particular
computer's initial report of membership in a group. The default is 10 seconds.
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