Operation Manual – SNMP and RMONH3C S7500 Series Ethernet Switches Chapter 2 RMON Configuration2-3z Sampling the alarm variables referenced in the defined extended alarmexpressions once in each specified periodz Performing operations on sampled values according to the defined operationformulasz Comparing the operation result with the set threshold and triggeringcorresponding events if the operation result exceeds the threshold.IV. History groupAfter a history group is configured, the Ethernet switch collects network statisticsinformation periodically and stores the statistics information temporarily for laterretrieval. A history group can provide the history data of the statistics on networksegment traffic, error packets, broadcast packets, and bandwidth utilization.With the history data management function, you can configure network devices, suchas collecting history data, collecting the data of a specific port periodically and savingthem.V. Statistics groupA statistics group contains the statistics of each monitored port on a network device. Anentry in a statistics group is an accumulated value counting from the time when thestatistics group is created.The statistics include the number of the following items: collisions, cyclic redundancycheck (CRC) error packets, undersized (or oversized) packets, broadcast packets,multicast packets, and received bytes and packets.With the RMON statistics management function, you can monitor the usage of a portand make statistics on the errors occurring when the ports are being used.2.2 RMON Configuration2.2.1 PrerequisitesBefore performing RMON configuration, make sure the SNMP agents are correctlyconfigured. For the information about SNMP agent configuration, refer to the“Configuring Basic SNMP Functions” part in SNMP Configuration Operation Manual.2.2.2 Configuring RMONTo do… Use the command… RemarksEnter system view system-view —Add an event entryrmon event event-entry[ description string ] { log |trap trap-community | log-traplog-trapcommunity | none }[ owner text ]Optional
