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User’s Manual 81
Manageable 8/9-Port Switch
MIB-2 defines a set of manageable objects in various layers of the TCP/IP protocol suites. MIB-2
covers all manageable objects from layer 1 to layer 4 and, as a result, is the major SNMP MIB sup-
ported by all vendors in the networking industry. The switch supports a
complete implementation of SNMP Agent and MIB-2.
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.
RMON MIB (RFC 1757) AND BRIDGE MIB (RFC 1493)