25-2
Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter 25 Configuring RMON
Configuring RMON
Figure 25-1 Remote Monitoring Example
The switch supports these RMON groups (defined in RFC 1757):
• Statistics (RMON group 1)—Collects Ethernet, Fast Ethernet, and Gigabit Ethernet statistics on an
interface.
• History (RMON group 2)—Collects a history group of statistics on Ethernet, Fast Ethernet, and
Gigabit Ethernet 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)—Determines 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 Cisco IOS release use hardware counters for RMON data processing,
the monitoring is more efficient, and little processing power is required.
Configuring RMON
This section describes how to configure RMON on your switch. It contains this configuration
information:
• Default RMON Configuration, page 25-3
• Configuring RMON Alarms and Events, page 25-3
• Configuring RMON Collection on an Interface, page 25-5
Catalyst 3550 switch
RMON alarms and events
configured. SNMP configured.
Catalyst 2950
or 2955 switch
RMON history
and statistic
collection enabled.
Workstations
74602
Catalyst 3550
switch
Workstations
Network management station with
generic RMON console application
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