1-11 RMON ConfigurationWhen configuring RMON, go to these sections for information you are interested in:z RMON Overviewz Configuring RMONz Displaying and Maintaining RMONz RMON Configuration ExampleRMON OverviewThis section covers these topics:z Introductionz RMON GroupsIntroductionRemote Monitoring (RMON) is implemented based on the Simple Network Management Protocol(SNMP) and is fully compatible with the existing SNMP framework without the need of any modificationon SNMP.RMON provides an efficient means of monitoring subnets and allows SNMP to monitor remote networkdevices in a more proactive and effective way. It reduces traffic between network management station(NMS) and agent, facilitating large network management.RMON comprises two parts: NMSs and agents running on network devices.z Each RMON NMS administers the agents within its administrative domain.z An RMON agent resides on a network monitor or a network probe. It monitors and collects statisticson traffic over the network segments connected to its interfaces, such as the total number ofpackets passed through a network segment over a specified period, or the total number of goodpackets sent to a host.Working MechanismRMON allows multiple monitors. A monitor provides two ways of data gathering:z Using RMON probes. NMSs can obtain management information from RMON probes directly andcontrol network resources. In this approach, RMON NMSs can obtain all RMON MIB information.z Embedding RMON agents in network devices such as routers, switches, and hubs to provide theRMON probe function. RMON NMSs exchange data with RMON agents using basic SNMPcommands to gather network management information, which, due to system resources limitation,may not cover all MIB information but four groups of information, alarm, event, history, andstatistics, in most cases.The device adopts the second way. By using RMON agents on network monitors, an NMS can obtaininformation about traffic size, error statistics, and performance statistics for network management.
