9-12 CHAPTER 9: STATUS MONITORING AND STATISTICSA typical RMON setup consists of the following two components:n The RMON probe — An intelligent, remotely controlled device orsoftware agent that continually collects statistics about a LANsegment or VLAN. The probe transfers the information to amanagement workstation on request or when a predefinedthreshold is crossed.n The management workstation — Communicates with theRMON probe and collects the statistics from it. The workstation doesnot have to be on the same network as the probe, and can managethe probe by in-band or out-of-band connections.About the RMONGroupsThe Switch 3800 supports the following four RMON groups:n Statisticsn Historyn Alarmsn EventsThis section describes how to use each of these groups to monitor yournetwork.StatisticsThe Statistics group provides traffic and error statistics; showingpackets, bytes, broadcasts, multicasts, and errors on a LAN segment orVLAN.Information from the Statistics group can be used to detect changes intraffic and error patterns in critical areas of the network.HistoryThe History group provides historical views of network performance bytaking periodic samples of the counters supplied by the Statistics group.The group features user-defined sample intervals and bucket countersfor complete customization of trend analysis.The group is useful for analysis of traffic patterns and trends on a LANsegment or VLAN, and to establish baseline information indicatingnormal operating parameters.
