Configuration 709Monitoring local devices does not involve the use of WAN links, and sothese can use more frequent polling rates than remote devices, providinga more accurate picture of the state of these devices.Similarly, remote devices that you monitor in response monitoring modegenerate less traffic at each poll than devices that you monitor in fullmonitoring mode. As a result, a remote site where most or all of thedevices are monitored in response monitoring mode can be polled morefrequently than one where most or all of the devices are monitored in fullmonitoring mode.This means that, by carefully choosing a few select devices at a remotesite that require full monitoring and using response monitoring for allother devices at that site, you can poll the devices at that site morefrequently than otherwise would have been possible.Unless they are critical servers, it is recommended that you do notmonitor end stations at remote sites at all.Issues and Techniques when Configuring Monitoring Modes andPoll RatesMonitoring modes and poll rates are configured in 3Com NetworkDirector using the same hierarchy as the Retry/Timeout settings. As aresult, the things to bear in mind when configuring monitoring modesand poll rates in a multi-site network are similar to those encounteredwhen configuring the Retry/Timeout hierarchy:Before starting to configure the monitoring modes and poll rateshierarchy, it is important to correctly identify the local and remote siteswith regards to the PC that 3Com Network Director is running on. Wherepossible, each site should be identified by the IP subnets that are uniqueto that site.If you have determined that there are different monitoring mode and pollrate requirements for different devices within the same IP subnet thenyou will be unable to override the whole map settings at the subnet levelsuch that you satisfy the requirements of all of the devices in that subnet.For example, you may have determined that the majority of the deviceswithin a subnet that is located at a remote site should be monitored inresponse monitoring mode with 300 second polls for the core devicesand 900 second polls for the non-core devices, while some of the moreimportant devices in the subnet should be monitored in full monitoringmode with 120 second polls.
