SMC Networks SMC8612XL3 F 1.0.1.3 Management Manual page 256

C
ONFIGURING THE
(Range: 1-4094)
• IGMP Protocol Status (Admin Status) – Enables IGMP on a VLAN
interface. (Default: Disabled)
• Last Member Query Interval – A multicast client sends an IGMP
leave message when it leaves a group. The router then checks to see if
this was the last host in the group by sending an IGMP query and
starting a timer based on this command. If no reports are received
before the timer expires, the group is deleted. (Range: 0-25 seconds;
Default: 1 second)
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• Max Query Response Time – Configures the maximum response
time advertised in IGMP queries. (Range: 0-25 seconds; Default: 10
seconds)
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• Query Interval – Configures the frequency at which host query
messages are sent. (Range: 1-255; Default: 125 seconds)
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WITCH
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 switch must be using IGMPv2 for this command to take
effect.
This command defines how long any responder (i.e., client or
router) still in the group has to respond to a query message before
the router deletes the group.
By varying the Maximum Query Response Time, you can tune the
burstiness of IGMP messages passed on the subnet; where larger
values make the traffic less bursty, as host responses are spread
out over a larger interval.
The number of seconds represented by the maximum response
interval must be less than the Query Interval.
Multicast routers send host query messages to determine the
interfaces that are connected to downstream hosts requesting a