Chapter 1 Rmon Configuration; Introduction To Rmon; Working Mechanism Of Rmon - Huawei Quidway S3100 Series Operation Manual

Operation Manual – RMON
Quidway S3100 Series Ethernet Switches

Chapter 1 RMON Configuration

1.1 Introduction to RMON

Remote monitoring (RMON) is a kind of management information base (MIB) defined
by Internet Engineering Task Force (IETF) and is a most important enhancement made
to MIB II standards. RMON is mainly used to monitor the data traffic across a network
segment or even the entire network, and is currently a commonly used network
management standard.
An RMON system comprises two parts: the network management station (NMS) and
the agents running on each network device. RMON agents operate on network
monitors or network probes to collect and keep track of the statistics of the traffic across
the network segments to which their ports connect such as the total number of the
packets on a network segment in a specific period of time and the total number of
packets that are sent to a specific host successfully.
RMON is fully based on simple network management protocol (SNMP) architecture. It
is compatible with the current SNMP, so that you can implement RMON without
modifying SNMP. RMON enables SNMP to monitor remote network devices more
effectively and actively, thus providing a satisfactory means of monitoring the operation
of the subnet. With RMON, the communication traffic between NMS and agents is
reduced, thus facilitating the management of large-scale internets.

1.1.1 Working Mechanism of RMON

RMON allows multiple monitors. It collects data in one of the following two ways:
Using the dedicated RMON probe. When an ROM system operates in this way,
the NMS directly obtains management information from the RMON probes and
controls the network resources. In this case, all information in the RMON MIB can
be obtained.
Embedding RMON agents into network devices (such as routers, switches and
hubs) directly to make the latter capable of RMON probe functions. When an
RMON system operates in this way, the NMS collects network management
information by exchanging information with the SNMP agents using the basic
SNMP commands. However, this way depends on device resources heavily and
an NMS operating in this way can only obtain four groups of information (instead of
all the information in the RMON MIB). The four groups are alarm group, event
group, history group and statistics group.
An S3100 series switch implements RMON in the second way. Through the
RMON-capable SNMP agents running on the network monitors, an NMS can obtain the
information about the total traffic, error statistics and performance statistics of the
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Chapter 1 RMON Configuration