HP Network Direr Software Products manual Configuration

Configuration 705

may be quicker and easier to configure the Retry/Timeout hierarchy by configuring the whole map settings for these remote sites and then override the settings for the local site and any remote sites with different requirements.

This technique may still be used if you have a large number of remote sites for which the appropriate numbers of retries and timeout periods are similar, simply by examining the number of retries and timeout periods determined for each request type at each of the remote sites and selecting the largest values.

Configuring When monitoring a remote site, frequent polling of many devices on that Monitoring Modes site for large amounts of state information can quickly saturate a slow

and Poll Rates WAN link, leading to higher latency and less reliability in contacting the site.

In order to reduce the impact that monitoring has upon the WAN links that form the path to a monitored remote site, one or more of the following actions can be taken:

Reduce the poll rates. This has the effect of reducing the total amount of requests that will be made across the WAN link, but at the cost of the accuracy of the monitoring information.

For example, by reducing the poll rate for a device from once every 30 seconds to once every minute you will halve the amount of traffic generated by the monitoring of that device. However, you will double the amount of time it will take before 3Com Network Director determines if there is a problem with the device.

Details of how to configure the poll rates used across your network are provided in “Controlling Monitoring Type and Polling Rates” on page 296.

Change the monitoring mode. There are three different monitoring modes available that will provide you with state information about a device. In order of traffic generated, from most to least, these are: full monitoring, response monitoring and SNMP traps only. The details of these three monitoring modes are provided in “Monitoring Mode” on page 296. Changing the monitoring mode for a remote device to one that generates less traffic reduces the amount of traffic that is generated across the WAN link by each monitoring poll for that device (or, in the