Your software release may not support all the features documented in
this module. For the latest caveats and feature information, see Bug Search
Tool and the release notes for your platform and software release. To find
information about the features documented in this module, and to see a list of
the releases in which each feature is supported, see the feature information
table at the end of this module.
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Information About RMON
RMON is an Internet
Engineering Task Force (IETF) standard monitoring specification that defines a
set of statistics and functions that can be exchanged between RMON-compliant
console systems and network probes. RMON provides comprehensive network-fault
diagnosis, planning, and performance-tuning information.
The following figure
shows a sample configuration of the RMON feature with the Simple Network
Management Protocol (SNMP) agent in the
switch. This monitors all the traffic flowing
among all the
switches on all connected LAN segments.
Figure 1. Remote
switch supports these RMON groups (defined in
Statistics (RMON group
1)—Collects Ethernet statistics (including Fast Ethernet and Gigabit Ethernet
statistics, depending on the
switch type and supported interfaces) on an
History (RMON group
2)—Collects a history group of statistics on Ethernet ports (including Fast
Ethernet and Gigabit Ethernet statistics, depending on the
switch type and supported interfaces) for a
specified polling interval.
Alarm (RMON group 3)—Monitors
a specific management information base (MIB) object for a specified interval,
triggers an alarm at a specified value (rising threshold), and resets the alarm
at another value (falling threshold). Alarms can be used with events; the alarm
triggers an event, which can generate a log entry or an SNMP trap.
Event (RMON group
9)—Specifies the action to take when an event is triggered by an alarm. The
action can be to generate a log entry or an SNMP trap.
switches supported by this software release use
hardware counters for RMON data processing, the monitoring is more efficient,
and little processing power is required.
64-bit counters are not supported for RMON alarms.
Adds an event in
the RMON event table that is associated with an RMON event number.
an event number. The range is 1 to 65535.
a description of the event.
log keyword to
generate an RMON log entry when the event is triggered.
the owner of this event.
enter the SNMP community string used for this trap.
privileged EXEC mode.
Switch# show running-config
Verifies your entries.
Switch# copy running-config startup-config
(Optional) Saves your entries
in the configuration file.
What to Do Next
To disable an alarm,
no rmon alarmnumber global
configuration command on each alarm you configured. You cannot disable at once
all the alarms that you configured. To disable an event, use the
no rmon eventnumber global
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