Siemens S223 - Manual (Page 126)

UMN:CLI User Manual
SURPASS hiD 6615 S223/S323 R1.5
126 A50010-Y3-C150-2-7619
7.4 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 mounted SNMP agent, RMON gives 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 cur-
rent 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 defined RMON MIB
groups in RFC 1757: Statistics, History, Alarm, Host, Host Top N, Matrix, Filter, Packet
Capture and Event. The system supports two MIB groups of them, most basic ones: Sta-
tistics (only for uplink ports) and History.
7.4.1 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.
The following is an example of displaying the default configuration of RMON history.
SWITCH(config)# show rmon-history config 5
RMON History configuration:
===========================
history index : 5
data source : 0/1 (1)
buckets requested : 50
buckets granted : 50
interval time (s) : 1800
owner : none
status : under create
SWITCH(config)#
To open RMON-history mode, use the following command.
Command Mode Description
rmon-history <1-65535> Global
Opens RMON-history Configuration mode.
1-65535: index number
The following is an example of opening RMON-history Configuration mode with index
number 5.
SWITCH(config)# rmon-history 5
SWITCH(config-rmonhistory[5])#
Input a question mark <?> at the system prompt on RMON Configuration mode if you