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82 CHAPTER 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
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
Router
To configure RMON after SNMP, first configure RMON command lines on the
3Com Router series. Then enable RMON statistics before NMS can be used to
monitor network traffic and perform network management.
RMON configuration includes:
Router
Ethernet
Ethernet
Router
Bridge
PC with RMON
Ethernet
Bridge
With RMON function
Router
Internet
Console with RMON
FDDI
Backbone