Chapter 23 Configuring Rmon - Cisco 3845 - Security Bundle Router Software Manual

Understanding RMON
Figure 23-1
RMON alarms and events
configured. SNMP configured.
The switch supports these RMON groups (defined in RFC 1757):
Statistics (RMON group 1)—Collects Ethernet statistics (including Fast Ethernet and Gigabit
•
Ethernet statistics, depending on the switch type and supported interfaces) on an interface.
• 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.
Because switches supported by this software release use hardware counters for RMON data processing,
the monitoring is more efficient, and little processing power is required.
Note 64-bit counters are not supported for RMON alarms.
Cisco ME 3800X and 3600X Switch Software Configuration Guide
23-2
Remote Monitoring Example
Network management station with
generic RMON console application
RMON history
and statistic
collection enabled.
Workstations Workstations
Chapter 23 Configuring RMON
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