Rmon; Configure Rmon - 3Com 7700 Configuration Manual

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HAPTER YSTEM

RMON

Configure RMON

M
ANAGEMENT
Remote Network Monitoring (RMON) is a type of IETF-defined MIB. It is the most
important enhancement to the MIB II standard. It is used for monitoring the data
traffic on a segment and even on a whole network. It is one of the widely used
Network Management standards by far.
RMON is based on the SNMP architecture (which is one of its outstanding
advantages) and compatible with the existing SNMP framework, so it is
unnecessary to adjust the protocol. RMON includes NMS and the Agent running
on the network devices. On the network monitor or detector, RMON Agent tracks
and accounts different traffic information on the segment connected to its port,
such as the total number of packets on a segment in a certain period of time or
that of the correct packets sent to a host. ROMN helps the SNMP monitor the
remote network device more actively and effectively, which provides a highly
efficient means for monitoring subnet operations. RMON can reduce
communication traffic between the NMS and the agent, thus facilitating an
effective management over large interconnected networks.
RMON allows multiple monitors. It can collect data in two ways.
One is with a special RMON probe. NMS directly obtains the management
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information from the RMON probe and controls the network resource. In this
way, it obtains all the information of RMON MIB
Another way is to implant the RMON Agent directly into the network devices
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(e.g. router, switch, HUB, etc.), so that the devices become network facilities
with RMON probe functions. RMON NMS uses the basic SNMP commands to
exchange data information with SNMP Agent and collect NM information.
However, not all the data of RMON MIB can be obtained with this method,
depending on resources. In most cases, only four groups of information can be
collected. The four groups include trap information, event information, history
information and statistics information.
The Ethernet Switch implements RMON in the second method. With the
RMON-supported SNMP Agent running on the network monitor, NMS can obtain
such information as the overall traffic of the segment connected to the managed
network device port, the error statistics and performance statistics, thereby
implementing the management (generally remote management) over the
network.
RMON configuration includes:
Add/Delete an Entry to/from the Alarm Table
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Add/Delete an Entry to/from the Event Table
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Add/Delete an Entry to/from the History Control Table
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Add/Delete an Entry to/from the extended RMON alarm table
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Add/Delete an Entry to/from the Statistics Table
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Add/Delete an Entry to/from the Alarm Table
RMON alarm management can monitor the specified alarm variables such as
statistics on a port. When a value of the monitored data exceeds the defined
threshold, an alarm event will be generated. Generally, the event will be recorded
in the device log table and a Trap message will be sent to NMS. The events are