History And Axfddihistory Groups; Alarm Group - 3Com CoreBuilder 2500 User Manual

History and The history and axFDDIHistory groups record periodic statistical samples
axFDDIHistory for Ethernet and FDDI interfaces and store them for later retrieval. The
Groups information available per interface for each time interval includes these
statistics:

Alarm Group

The CoreBuilder 2500 system supports the following RMON alarm
mechanisms:
These RMON MIB objects yield alarms when the network exceeds
predefined limits. The most frequently used objects are counters,
although the other objects may be used in much the same way. The
balance of this chapter illustrates RMON functions using counters.
Counters hold and update the number of times an event occurs on a
port, module, or switch. Alarms monitor the counters and report when
counters exceed their set threshold.
Counters are useful when you compare their values at specific time
intervals to determine rates of change. The time intervals can be short or
long, depending on what you measure.
Number of received octets
Number of received packets
Number of received broadcast packets
Number of received multicast packets
Number of received packets with CRC or alignment errors
Number of received packets that are undersized but otherwise
well-formed
Number of received packets that are oversized but otherwise
well-formed
Number of detected transmit collisions
Estimate of the mean physical layer network utilization
Counters
Gauges
Integers
Timeticks
RMON Groups 15-5