3com 8807 User Guide
65
RMON C
ONFIGURATION
RMON Overview
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.
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.
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
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.
(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 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.
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.
Configuring RMON
n
Before configuring RMON, you must ensure that the SNMP agent is properly
configured. See “SNMP Configuration” for the SNMP agent configuration.
configured. See “SNMP Configuration” for the SNMP agent configuration.