26. Remote MonitoringMN700004 Rev 01 305The Ethernet Statistics GroupThe Ethernet Statistics group contains statistics of packets, bytes, broadcasts, multicasts, anderrors, measured by the probe for each monitored Ethernet interface on the switch.Information from the Statistics group is used to detect changes in traffic and error patterns incritical areas of the network.The History GroupThe History group provides historical views of network performance by taking periodicsamples of the counters supplied by the Statistics group.The group is useful for analyzing traffic patterns and trends on an Ethernet interface on theswitch and for establishing baseline information indicating normal operating parameters.The Alarms GroupThe Alarms group periodically takes statistical samples from variables in the probe andcompares them to previously configured thresholds. If the monitored variable crosses athreshold, an event is generated. Both rising and falling thresholds are supported, andthresholds can be specified on the absolute or delta value of a variable. In addition, alarmthresholds can be set manually or automatically.Alarms inform you of a network performance problem and can trigger automated actionresponses through the Events group.The Events GroupThe Events group controls the generation and notification of events from the switch. TheEvents group creates entries in an event log and/or sends SNMP traps to the managementworkstation. An event is triggered by an RMON alarm. The action taken can be configured toignore the event, to log it, to send an SNMP trap to the receivers listed in the trap receivertable, or to both log the event and send a trap. The RMON traps are defined in RFC 1757 forrising and falling thresholds.Effective use of the Events group saves you time. Rather than having to watch real-timegraphs for important occurrences, you can depend on the Events group for notification.Through the SNMP traps, events can trigger other actions, which provide a mechanism for anautomated response to certain occurrences.Supported Standards, MIBs and RFCsStandardsNo standards are supported by this feature.MIBsRFC 1757, Remote Network Monitoring Management Information Base
