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The Switch provides RMON capabilities that allow network administrators to set parameters and view
statistical counters defined in MIB-II, Bridge MIB, and RMON MIB. RMON activities are performed at a
Network Management Station running an SNMP network management application.
The Switch provides hardware-based RMON counters in the Switch chipset. The Switch manager CPU
polls these counters periodically to collect the statistics in a format that complies with the RMON MIB
definition.
8.3.1 RMON Groups Supported
The Switch supports the following RMON MIB groups defined in RFC1757:
RMON Statistics Group - m aintains utilization and error statistics for the Switch port being
monitored.
RMON History Group - gathers and stores periodic statistical samples from the previous
Statistics Group.
RMON Alarm Group - allows a network administrator to define alarm thresholds for any RMON
statistics MIB variable. An alarm can be associated with Low Threshold, High Threshold, or both.
An alarm is triggered when the value of a specific MIB variable exceeds a threshold, falls below a
threshold, or exceeds or falls below a threshold. A triggered alarm results in an event described in
the RMON Event Group.
RMON Event Group - allows a network administrator to define actions based on alarms. The
network administrator can specify the nature of the event that occurs when an alarm is triggered.
The event can be the creation of an RMON log entry or a trap, the creation of both an RMON log
entry and a trap, or the creation of neither.
SNMP Traps are generated when RMON Alarms are triggered. The action taken in the Network
Management Station depends on the specific network management application.
8.3.2 Bridge Groups Supported
The Switch supports the following four groups of Bridge MIB (RFC1493):
The dot1dBase Group - a mandatory group that contains the objects applicable to all types of
bridges.
The dot1dStp Group - contains the objects that denote the bridge's state with respect to the