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Management Guide
TigerAccess™ EE
7.4
7.4.1
SMC7824M/VSW
Remote Monitoring (RMON)
Remote Monitoring (RMON) is a function to monitor communication status of devices
connected to Ethernet at remote place. While SNMP can give information only about the
device mounting an SNMP agent, RMON gives network status information about overall
segments including devices. Thus, user can manage network more effectively. For in-
stance, in case of SNMP it is possible to be informed traffic about certain ports but
through RMON you can monitor traffics occurred in overall network, traffics of each host
connected to segment, and the current status of traffic between hosts.
Since RMON processes quite lots of data, its processor share is very high. Therefore,
administrator should take intensive care to prevent performance degradation and not to
overload network transmission caused by RMON. There are nine RMON MIB groups de-
fined in RFC 1757: Statistics, History, Alarm, Host, Host Top N, Matrix, Filter, Packet Cap-
ture and Event. The switch supports two MIB groups of them, most basic ones: Statistics
(only for uplink ports) and History.
RMON History
RMON history is periodical sample inquiry of statistical data about each traffic occurred in
Ethernet port. Statistical data of all ports are pre-configured to be monitored at 30-minute
interval, and 50 statistical data stored in one port. It also allows you to configure the time
interval to take the sample and the number of samples you want to save.
To open RMON Configuration mode, use the following command.
Command
rmon-history <1-65535>
The following is an example of opening RMON Configuration mode with index number 5.
SWITCH(config)# rmon-history 5
SWITCH(config-rmonhistory[5])#
Mode
Opens RMON Configuration mode.
Global
1-65535: index number
Description
CLI
155
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