356 3Com® VCX V7111 VoIP Gateway User GuideWhen the SNMP alarm traps are sent, the carrier-grade alarm system does not add or deletealarm traps as part of the feature. This system provides the mechanism for viewing of historyand current active alarm information.Active Alarm TableThe device maintains an active alarm table to allow a manager to determine which alarmsare currently active in the device. Two views of the active alarm table are supported by theagent: acActiveAlarmTable in the enterprise acAlarm alarmActiveTable and alarmActiveVariableTable in the IETF standard ALARM-MIB(rooted in the AC tree)The acActiveAlarmTable is a simple, one-row per alarm table that is easy to view with a MIBbrowser.The ALARM-MIB is currently a draft standard and therefore has no OID assigned to it. In thecurrent software release, the MIB is rooted in the experimental MIB subtree. In a futurerelease, after the MIB has been ratified and an OID assigned, it is to move to the official OID.Alarm HistoryThe device maintains a history of alarms that have been raised and traps that have beencleared to allow a manager to recover any lost, raised or cleared traps. Two views of thealarm history table are supported by the agent: acAlarmHistoryTable in the enterprise acAlarm nlmLogTable and nlmLogVariableTable in the standard NOTIFICATION-LOG-MIBAs with the acActiveAlarmTable, the acAlarmHistoryTable is a simple, one-row-per-alarmtable that is easy to view with a MIB browser.Cold Start TrapV7111 technology supports a cold start trap to indicate that the device is starting. This allowsthe manager to synchronize its view of the device's active alarms. Two different traps aresent 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 atsystem initialization. The enterprise acBoardEvBoardStarted which is generated at the end of systeminitialization. This is more of an application-level cold start sent after the entire initializingprocess is complete and all the modules are ready.
