Introduction To Rmon And Rmon2 - Huawei S9300 Configuration Manual

S9300&S9300E Terabit Routing Switch
Configuration Guide - Network Management

8.1 Introduction to RMON and RMON2

This part describes working principles of and differences between RMON and RMON2.
RMON
RMON is implemented based on the Simple Network Management Protocol (SNMP)
architecture, and is compatible with the existing SNMP framework. There are two concepts
involved in RMON, namely, the Network Management Workstation (NM Station) and the agent.
A RMON agent collects statistics of various traffic in a network, including the number of packets
on a network segment within a period and the number of correct packets sent to a host.
Compared with SNMP, RMON monitors remote network devices more efficiently and actively.
It provides an efficient solution to monitor the running of sub-networks, which reduces the
communication traffic between the NM Station and the agent. Large-sized networks can thus be
managed in a simple and effective manner.
RMON allows multiple monitors. It collects data in the following ways:
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Currently, the S9300&S9300E implements the monitoring and statistics collection function only
on the Ethernet interfaces of network devices.
RMON2
RMON2 is one of the RMON MIB standards. It functions as a supplement to RMON and add
some new groups. RMON monitors the traffic only at the MAC layer whereas RMON2 can
monitor the traffic at the MAC layer and above it (here, the MAC layer refers to the Ethernet
layer). RMON and RMON2 are both used to monitor Ethernet links.
RMON2 can decode data packets of Layer 3 to Layer 7 in the OSI model.
A RMON2 agent provides the following functions:
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Use a dedicated RMON Probe.
The NM Station obtains management information directly from the RMON Probe and
controls network resources. This ensures that the NM Station can obtain overall information
on the RMON MIB.
Embed a RMON agent into a network device (a switch for example) to enable the device
to be of the RMON Probe capability.
The NM Station uses the basic SNMP commands for exchanging data with the RMON
agent and collecting the network management information. This process is restricted by
device resources and hence the NM Station collects only information on four groups (alarm,
event, history, and statistics) and not the complete information on the RMON MIB.
Monitors the traffic based on the network layer protocols and addresses, including the IP
protocol.
An agent can learn its connected external LAN network segments and monitor the traffic
entering the LAN through the switch.
Records the incoming and outgoing traffic to and from a specific application because it is
capable of decoding and monitoring the traffic of applications, such as email, FTP, and
WWW.
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