3Com 3032 Configuration Manual page 511

Configuring the Version
Number of IGMP at the
Router Interface
Configuring the Time
Interval of IGMP Host
Sending Query
Messages
Configuring IGMP
Maximum Query
Response Time
IGMP Version 2 is able to configure query message timeout and the maximum
query response time. All the systems in the same subnet must run the same IGMP
version because the routers are not able to check the version number of IGMP
currently running on the interface.
Make the following configuration in the interface view.
Table 578 Configure the IGMP Version Number Run at Router Interface
Operation
Configure the version number of IGMP
operating at router interface
Restore the default value of the version
number of IGMP operating at router
interface
By default, IGMP Version 2 is operates at the router interface.
If the host does not support IGMP Version 2, then the router must be configured
to use IGMP Version 1.
The router periodically sends membership query messages to the network it
connects to. The query interval timer sets the time interval. Subscribers can change
the time interval of the IGMP host that sends query messages by configuring the
query interval timer.
Make the following configuration in the interface view.
Table 579 Configure the Time Interval of IGMP Host Sending Query Messages
Operation
Configure the time interval of IGMP host
sending query messages
Restore the default value of the time
interval of IGMP host sending query
messages
By default, the interval for sending query messages is 125 seconds.
After the host receives the query message periodically sent by the router, it starts
delay timers for each of the multicast groups it joins. A random number between
zero and the maximum response time will be adopted to serve as the initial value.
The maximum response time is the query message assigned maximum response
time (the maximum response time of IGMP Version 1 is fixed at 10 seconds). The
host broadcasts the membership report to the router before the timer times out. If
the router does not receive a membership report when the maximum query
response time times out, it assumes that there is no local group member, and it
does not send the received multicast message to the network it connects to.
Make the following configuration in interface view.
Table 580 Configure IGMP Maximum Query Response Time
Operation
Configure IGMP maximum query response
time
Configuring IGMP
Command
igmp version { 1 | 2 }
undo igmp version
Command
igmp timer query seconds
undo igmp timer query
Command
igmp max-response-time seconds
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