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Motorola Netopia® Router CLI Commands 2-71
Beginning with Firmware version 8.7, v3 is the default.
igmp snooping [ yes | no ]
no igmp snooping
show igmp snooping
These commands allow you to enable, disable, or show the status of the Motorola Netopia
®
Router’s ability to
“listen in” to IGMP traffic. IGMP “snooping” is a feature of Ethernet layer 2 switches that “listens in” on the
IGMP conversation between computers and multicast routers. Through this process, it builds a database of
where the multicast routers reside by noting IGMP general queries used in the querier selection process and by
listening to other router protocols.
From the host point of view, the snooping function listens at a port level for an IGMP report. The switch then
processes the IGMP report and starts forwarding the relevant multicast stream onto the host's port. When the
switch receives an IGMP leave message, it processes the leave message, and if appropriate stops the
multicast stream to that particular port. Basically, customer IGMP messages although processed by the switch
are also sent to the multicast routers.
igmp robustness value
no igmp robustness
show igmp robustness
These commands allow you to specify or show the Motorola Netopia
®
Router’s degree of sensitivity to lost
packets. IGMP can recover from robustness minus 1 lost IGMP packet. The default value is 2. The range is 2 –
255.
igmp query-intvl value
no query-intvl
show query-intvl
These commands allow you to specify or show the amount of time in seconds between IGMP General Query
messages sent by the querier router. The default query interval is 125 seconds. The range is 10s – 600s.
igmp query-response-intvl value
no query-response-intvl
show query-response-intvl
These commands allow you to specify or show 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 interval is 10
seconds and must be less than the query interval. The range is 5 deci-sec – 255 deci-sec; the default is 100
deci-sec.
igmp last-member-query-intvl value
show igmp last-member-query-intvl
These commands allow you to specify or show the amount of time in deci-seconds that the router waits to
receive a response to a Group-Specific Query message, when igmp-version is set to v2 or v3..
igmp last-member-query-count value
show igmp last-member-query-count
These commands allow you to specify or show the number of Group-Specific Query messages sent.