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User Guide 1068
RMONConfiguring SNMP & RMON
4
RMON
RMON (Remote Network Monitoring) together with the SNMP system allows the network
manager to monitor remote network devices efficiently. RMON reduces traffic flow
between the NMS and managed devices, which is convenient to manage large networks.
RMON includes two parts: the NMS and the Agents running on every network device. The
NMS is usually a host that runs the management software to manage Agents of network
devices. The Agent is usually a switch or router that collects traffic statistics (such as the
total number of packets on a network segment during a certain time period, or total number
of correct packets that are sent to a host). Based on SNMP protocol, the NMS collects
network data by communicating with Agents. However, the NMS cannot obtain every
datum of RMON MIB because the device resources are limited. Generally, the NMS can only
get information of the following four groups: Statistics, History, Event and Alarm.
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Statistics: Collects Ethernet statistics (like the total received bytes, the total number of
broadcast packets, and the total number of packets with specified size) on an interface.
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History: Collects a history group of statistics on Ethernet ports for a specified polling
interval.
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Event: Specifies the action to be taken when an event is triggered by an alarm. The
action can be to generate a log entry or an SNMP trap.
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Alarm: Monitors a specific MIB object for a specified interval, and triggers an event at a
specified value (rising threshold or falling threshold).
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