Allied Telesis AR400 manual Example of bad choices for timer values, Timer, New value

Example of bad choices for timer values > Example

Example of bad choices for timer values

It is generally unwise to change any of the default IGMP settings unless you have advanced knowledge of how IGMP works. As "Timer and counter relationships" on page 69 describes, most of the timers and counters are related. This means setting timers can cause problems unless you understand the potential impact on the IGMP process.

This example sets three timers to excessively short values and discusses the potential consequences.

Example

Imagine the following changes to the configuration:

Timer	New value
Last Member Query Interval	5
Query Response Interval	5
Default Timeout Interval	126

The commands to configure these settings are:

set ip igmp lmqi=5

set ip igmp queryresponseinterval=5

set ip igmp timeout=126

The resulting values are displayed in the following output.

Manager Switch 1> show ip igmp

IGMP Protocol

------------------------------------------------------------------------

Status	Enabled
Default Query Interval	125		secs
Default Timeout Interval	126		secs
Last Member Query Interval	5	(1/10secs)
Last Member Query Count	2
Robustness Variable	2
Query Response Interval	5	(1/10secs)
.

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Page 83 AlliedWare™ OS How To Note: IGMP