3Com 10014299 manual Schematic diagram of Rmon application

82CHAPTER 5: CONFIGURING NETWORK MANAGEMENT

thus managing large-scale interconnection networks easily and effectively. RMON also allows several monitors and can collect data in two ways: one is to collect with the RMON probe — NMS directly obtains management data from an RMON probe and controls network resources. In this way, all RMON MIB data can be obtained. The other way is by the RMON Agent directly implanted in network equipment (router, switch and HUB) which will become network facilities with RMON probe function. NMS exchanges data information with them and collects network management information through SNMP basic commands. However, limited by equipment resources, not all RMON MIB data can be obtained this way. In most cases, only four groups of information can be collected. Currently, the 3Com Router 1.x implements RMON in the second way.

RMON-MIB is composed of a group of statistics data, analysis data and diagnosis data. Standard MIB not only provides a lot of the original port data of the managed object, but it provides statistics data and calculation results of a network segment. By running SNMP Agent supporting RMON on the network monitor, NMS can obtain the overall flow, error statistics, and performance statistics of the network segment, that connects the interfaces of managed network equipment so as to fulfill network management. An RMON application example is shown below:

Figure 36 Schematic diagram of RMON application

Console with RMON Ethernet

Router Bridge

Internet

Router Ethernet

Router	Bridge
	With RMON function
	FDDI	Ethernet
	Backbone

PC with RMON

The value includes three managed objects. With enhanced RMON alarm group function, if a sample is found to cross the threshold, which has been configured, RMON Agent will report to NMS so as to avoid a lot of query messages of the NMS.

Configure RMON on the To configure RMON after SNMP, first configure RMON command lines on the Router 3Com Router series. Then enable RMON statistics before NMS can be used to

monitor network traffic and perform network management.

RMON configuration includes: