RMON is an Internet Engineering Task Force (IETF) standard monitoring specification that allows various network agents and console systems to exchange network monitoring data. You can use the RMON feature with the Simple Network Management Protocol (SNMP) agent in the switch to monitor all the traffic flowing among switches on all connected LAN segments as shown in Figure 72.
Figure 72 Remote Monitoring Example
The switch supports these RMON groups (defined in RFC 1757):
■Statistics (RMON group 1)—Collects Ethernet statistics on an interface.
■History (RMON group 2)—Collects a history group of statistics on Ethernet ports 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.
RMON is disabled by default; no alarms or events are configured.