2-12 RMON ConfigurationWhen configuring RMON, go to these sections for information you are interested in:z Introduction to RMONz RMON Configurationz Displaying RMONz RMON Configuration Example2.1 Introduction to RMONRemote Monitoring (RMON) is a kind of MIB defined by Internet Engineering Task Force (IETF). Itis an important enhancement made to MIB II standards. RMON is mainly used to monitor the datatraffic across a network segment or even the entire network, and is currently a commonly usednetwork management standard.An RMON system comprises of two parts: the network management station (NMS) and the agentsrunning on network devices. RMON agents operate on network monitors or network probes tocollect and keep track of the statistics of the traffic across the network segments to which theirports connect, such as the total number of the packets on a network segment in a specific period oftime and the total number of packets successfully sent to a specific host.z RMON is fully based on SNMP architecture. It is compatible with the current SNMPimplementations.z RMON enables SNMP to monitor remote network devices more effectively and actively, thusproviding a satisfactory means of monitoring remote subnets.z With RMON implemented, the communication traffic between NMS and SNMP agents canbe reduced, thus facilitating the management of large-scale internetworks.2.1.1 Working Mechanism of RMONRMON allows multiple monitors. It can collect data in the following two ways:z Using the dedicated RMON probes. When an RMON system operates in this way, the NMSdirectly obtains management information from the RMON probes and controls the networkresources. In this case, all information in the RMON MIB can be obtained.z Embedding RMON agents into network devices (such as routers, switches and hubs) directlyto make the latter capable of RMON probe functions. When an RMON system operates inthis way, the NMS collects network management information by exchanging information withthe SNMP agents using the basic SNMP commands. However, this way depends on deviceresources heavily and an NMS operating in this way can only obtain the information aboutthese four groups (instead of all the information in the RMON MIB): alarm group, event group,history group, and statistics group.An H3C S5100-SI/EI Ethernet switch implements RMON in the second way. With an RMON agentembedded in, an S5100-SI/EI Ethernet switch can serve as a network device with the RMON
