6. SNMP & RMON Management -214
6.3 RMON MIB (RFC 1757) and Bridge MIB (RFC
1493)
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.
RMON GROUPS SUPPORTED
The switch supports the following RMON MIB groups defined in
RFC 1757:
RMON Statistics Group – maintains 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 MIB variable. An alarm can
be associated with Low Threshold, High Threshold, or both.
A trigger can trigger an alarm when the value of a specific
MIB variable exceeds a threshold, falls below a threshold, or
exceeds or falls below a threshold.
RMON Event Group – allows a network administrator to
define actions based on alarms. SNMP Traps are generated
when RMON Alarms are triggered. The action taken in the
Network Management Station depends on the specific
network management application.