
Customizing IGMP
117355-A Rev. A 3-17
Specifying a Designated Router Timeout Interval
By default, 140 seconds can elapse after the last host query message before IGMP
considers the designated router to be down.
The value you specify should be greater than the query rate of all IGMP routers on
the network. The suggested value is (2 * Query Rate) + 20.
You can use the BCC or Site Manager to specify a timeout interval from 10 to
8192 seconds.
Using the BCC
Navigate to the IGMP prompt for the interface and enter
dr-timeout
seconds
seconds is an interval from 10 to 8192 seconds.
For example, the following command sets the timeout interval to 200 seconds:
igmp/2.2.2.2/3# dr-timeout 200
igmp/2.2.2.2/3#
Using Site Manager
Site Manager Procedure
You do this System responds
1. In the Configuration Manager window,
choose Protocols.
The Protocols menu opens.
2. Choose IP. The IP menu opens.
3. Choose Multicast. The Multicast menu opens.
4. Choose IGMP. The IGMP menu opens.
5. Choose Entry. The IGMP Entry Interface Parameters
window opens.
6. Set the Designated Router Timeout
parameter. Click on Help or see the
parameter description on page A-19.
7. Click on Apply, and then click on Done. You return to the Configuration Manager
window.
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