Alarm History; Cold Start Trap; Third-Party Performance Monitoring Measurements - 3Com VCX V7122 User Manual

The ALARM-MIB is currently a draft standard and therefore has no OID assigned to it. In the
current software release, the MIB is rooted in the experimental MIB subtree. In a future
release, after the MIB has been ratified and an OID assigned, it is to move to the official OID.

Alarm History

The device maintains a history of alarms that have been raised and traps that have been
cleared to allow a manager to recover any lost, raised or cleared traps. Two views of the
alarm history table are supported by the agent:
acAlarmHistoryTable in the enterprise acAlarm
nlmLogTable and nlmLogVariableTable in the standard NOTIFICATION-LOG-MIB
As with the acActiveAlarmTable, the acAlarmHistoryTable is a simple, one-row-per-alarm
table that is easy to view with a MIB browser.

Cold Start Trap

VCX V7122 technology supports a cold start trap to indicate that the device is starting. This
allows the manager to synchronize its view of the device's active alarms. Two different traps
are sent at start-up:
The standard coldStart trap - iso(1).org(3).dod(6).internet(1). snmpV2(6).
snmpModules(3). snmpMIB(1). snmpMIBObjects(1). snmpTraps(5). coldStart(1) - sent at
system initialization.
The enterprise acBoardEvBoardStarted which is generated at the end of system
initialization. This is more of an 'application-level' cold start sent after the entire initializing
process is complete and all the modules are ready.

Third-Party Performance Monitoring Measurements

Performance measurements are available for a third-party performance monitoring system
through an SNMP interface. These measurements can be polled at scheduled intervals by
an external poller or utility in a media server or other off-device system.
The device provides two types of performance measurements:
Gauges: Gauges represent the current state of activities on the device. Gauges, unlike
counters, can decrease in value, and like counters, can increase. The value of a gauge is
the current value or a snapshot of the current activity on the device.
Counters: Counters always increase in value and are cumulative. Counters, unlike
gauges, never decrease in value unless the off-device system is reset. the counters are
then zeroed.
Performance measurements are provided by three proprietary MIBs (acPerfMediaGateway,
acPerfMediaServices and acPerfH323SIPGateway). The first MIB is a generic-type of
performance measurements MIB available on all VCX V7122 and related devices. The
second is specific to the media server, and the third is for H.323/SIP media gateways.
The generic performance measurements MIB covers:
Control protocol
RTP stream
System packets statistics
176 3Com VCX V7122 SIP VoIP Gateway User Manual