C
ONFIGURING
THE
S
WITCH
3-202
(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)
- 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.
•Max Query Response Time – Configures the maximum response
time advertised in IGMP queries. (Range: 0-25 seconds; Default: 10
seconds)
- 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.
•Query Interval – Configures the frequency at which host query
messages are sent. (Range: 1-255; Default: 125 seconds)
- Multicast routers send host query messages to determ ine the
interfaces that are connected to downstream hosts reques ting a