296 CHAPTER 7: MONITORING THE NETWORKControllingMonitoring Type andPolling RatesDepending upon the topology and geographical distribution of yournetwork, regular polling of some segments of your network may causemore network traffic than is desirable.In order to address this, 3ComNetwork Director allows you to control the amount of traffic generatedon your network by the monitors.There is a three level hierarchy in thismechanism:■ Whole Map: The Monitoring tab in the Tools > Options dialog boxallows you to control the traffic generated by monitoring for thewhole map.Unless you explicitly override the settings at the subnet ordevice level, devices will use the settings you specify here.■ Subnet: The Monitoring tab in the Properties dialog box for a subnetallows you to override the whole map settings for a particular subnetand so control the traffic generated by the monitoring of deviceswithin that subnet.Unless you explicitly override the settings at thedevice level, devices within the subnet will use the settings you specifyhere.■ Device: The Monitoring tab in the Properties dialog box for a deviceallows you to override the whole map and, if applicable, subnetsettings for a particular device, and so control the traffic generated bythe monitoring of that device.Unless explicitly overridden at the device level, devices that appear inmore than one subnet, such as routers and layer-3 switches, inherit thewhole map settings directly rather than inheriting them from one of theirsubnets.The mechanism allows you to control two sets of parameters at eachlevel: the monitoring mode and the monitor poll rate.Monitoring ModeThere are various ways in which 3Com Network Director can monitoryour network, each of which generates a different amount of networktraffic.By selecting different monitoring modes you can control theamount of generated traffic.There are four basic monitoring modes thatare supported:Full Monitoring: When a device is monitored using full monitoringmode all of the monitors for the device are enabled.This monitoringmode provides the most monitoring information for a device and allowsyou to monitor links using that device, but generates the most traffic.
