18-3If the count result overpasses the same threshold multiple times, only the first one can cause an alarmevent. That is, the rising alarm and falling alarm are alternate.History groupThe history group periodically collects statistics on data at interfaces and saves the statistics in thehistory record table for query convenience. The statistics data includes bandwidth utilization, numberof error packets, and total number of packets.Once you successfully create a history entry in the specified interface, the history group starts toperiodically collect statistics on packet at the specified interface. Each statistical value is a cumulativesum of packets sent/received on the interface during a sampling period.Ethernet statistics groupThe statistics group monitors port utilization. It provides statistics about network collisions, CRCalignment errors, undersize/oversize packets, broadcasts, multicasts, bytes received, packets received,bytes sent, packets sent, and so on.After the creation of a statistics entry on an interface, the statistics group starts to collect trafficstatistics on the current interface. The result of the statistics is a cumulative sum.Configuring RMONConfiguration PrerequisitesBefore configuring RMON, configure the SNMP agent as described in SNMP Configuration in theSystem Volume.Configuration ProcedureFollow these steps to configure RMON:To do… Use the command… RemarksEnter system view system-view —Create an event entry in theevent tablermon event entry-number [ descriptionstring ] { log | log-trap log-trapcommunity |none | trap trap-community } [ owner text ]OptionalEnter Ethernet interface view interface interface-type interface-number —Create an entry in the historytablermon history entry-number buckets numberinterval sampling-interval [ owner text ] OptionalCreate an entry in the statisticstable rmon statistics entry-number [ owner text ] OptionalExit Ethernet interface view quit —
