Cabletron Systems SmartSTACK ETHERNET ELS10-27 User Manual

Contents

Monitoring and Managing Your SmartSTACK Ethernet ELS10-274-3• The Alarm Group: The Alarm Group periodically takes statisticalsamples from variables in the system and compares them to thresholdsthat have been configured. This group stores configuration entries thateach define, a variable, polling period, and threshold parameters.• The Event Group: The Event Group consists of two groups.• The Event GroupThe Event Group: The Event Group controls the generation andnotification of events from this device. Each entry in this groupdescribes the parameters of the event that can be triggered.and a sub group known as the• Log Group:The Log group is nothing more than a list of events. Each entryin this group is a set of data describing a given event that hasbeen logged.4.3.1 RMON High Level DescriptionThe History Control Group and the Ethernet HistoryGroupThese two groups work together to collect and save statistics for laterviewing. You can, via SNMP commands, create entries in the HistoryControl Group. Each control group identifies a source (data source) thatstatistics are taken from, an interval to control how often the statistics aretaken, and a requested number of statistical snapshots that should besaved (these snapshots are known as buckets).Up to 30 snapshots (buckets) per control group entry can be configuredand will be saved in memory. You are allowed to request up to amaximum of 400 buckets. Up to 30 buckets may be assigned to a ControlGroup as long as the total number of buckets does not exceed themaximum of 400.Each control group requires a timer to go off and trigger the collection ofdata. Once the data is collected it is stored in the next available bucket ofthe Ethernet History Group. Statistics are polled from the hardware andstored in memory. The RMON function does not collect statistics from thehardware directly, but rather references the copy in memory.