3com DUA1750-2BAA01 Manual De Usuario

3Com Switch 8800 Configuration Guide 

Chapter 48  RMON Configuration

 

48-1 

Remote Network Monitoring (RMON) is a type of IETF-defined MIB. It is the most 

important enhancement to the MIB II standard. It mainly 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 implemented fully based on the SNMP architecture (which is one of its 

outstanding advantages) and compatible with the existing SNMP framework, and 

therefore 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 the 

monitoring of the subnet operations. RMON can reduce the communication traffic 

between the NMS and the agent, thus facilitates an effective management over the 

large interconnected networks. 

RMON allows multiple monitors. It can collect data in two ways. 

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One is to collect data with a special RMON probe. NMS directly obtains the 

management information from the RMON probe and controls the network 

resource. In this way, it can obtain all the information of RMON MIB 

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Another way is to implant the RMON Agent directly into the network devices (for 

example router, switch and HUB), so that the devices become network facilities 

with RMON probe function. RMON NMS uses the basic SNMP commands to 

exchange data information with SNMP Agent and collect NM information. 

However, limited by the device resources, normally, not all the data of RMON MIB 

can be obtained with this method. In most cases, only four groups of information 

can be collected. The four groups include alarm information, event information, 

history information and statistics information. 

The Ethernet Switch implements RMON in the second method by far. 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.