UMN:CLI User Manual
V5808
160
7.3 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
instance, 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
defined in RFC 1757: Statistics, History, Alarm, Host, Host Top N, Matrix, Filter, Packet
Capture and Event. The V5808 supports two MIB groups of them, most basic ones:
Statistics (only for uplink ports) and History.
7.3.1 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.
Opens RMON Configuration mode.
1-65535: index number
The following is an example of opening RMON Configuration mode with index number 5.
SWITCH(config)# rmon-history 5
SWITCH(config-rmonhistory[5])#
Input a question mark <?> at the system prompt in RMON Configuration mode if you
want to list available commands.
The following is an example of listing available commands in RMON Configuration mode.
SWITCH(config-rmonhistory[5])# ?
RMON history configuration commands:
active Activate the history
data-source Set data source name for the ethernet port
do To run exec commands in config mode
exit End current mode and down to previous mode
help Description of the interactive help system
interval Define the time interval for the history
owner Assign the owner who define and is using the history
resources
requested-buckets Define the bucket count for the interval
show Show running system information
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