Deciphering SNMP Traps (Physical Entity Alarms)

[kwkirchner]

Can someone help me understand what my router is telling me with this trap:

Physical Entity Alarm Asserted Event
A physical entity with Entity Table Physical Index 3345, Alarm Type 30
has asserted an alarm with severity critical at time 61+21:51:56.

We are using CA Spectrum (9.2) as our NMS.  This trap came from a Cisco 6506. While the above is massaged slightly by the NMS, all of the relivant data is present.  The OID for this trap is 1.3.6.1.4.1.9.9.138.2 (Cisco Entity MIB):

ceAlarmAsserted NOTIFICATION-TYPE
VARIABLES {
    ceAlarmHistEntPhysicalIndex    1.3.6.1.4.1.9.9.138.1.3.3.1.3  PhysicalIndex                 
    ceAlarmHistAlarmType           1.3.6.1.4.1.9.9.138.1.3.3.1.4  AlarmType                     
    ceAlarmHistSeverity            1.3.6.1.4.1.9.9.138.1.3.3.1.5  AlarmSeverity                 
  {
     critical(1)
     major(2)
     minor(3)
     info(4)
  }
    ceAlarmHistTimeStamp           1.3.6.1.4.1.9.9.138.1.3.3.1.6  TimeStamp                     
}
DESCRIPTION
"The agent generates this trap when a physical entity asserts an alarm."

I was able to discern that the "3345" index was my POS3/1/1 ATM interface (a SPA-2XOC3-POS module) by looking at another table with my MIB browser (is there an IOS show command to make this less painful?).  The Alarm Type of "30" is what has me puzzled.  I have no idea where to go to cross-reference that into something meaningful. It might as well be a random integer at this point.

Any help is appreciated.

-Ken

[Joe Clarke]

You'll need to grab some data from additional MIB tables to decipher this trap.  To figure out which entity corresponds to entPhysicalIndex perform an SNMP Get on entPhysicalDescr.3345 from the ENTITY-MIB.  That will map the ID to a name.  To understand what alarm type 30 is, perform an SNMP Get on ceAlarmDescrText.30 from the CISCO-ENTITY-ALARM-MIB.  That will map the ID to a textual description of the alarm.

[NicoloBalestrino5695]

Hello,

Let's say i want to do the reverse,

I have this index: mib-2.47.1.1.1.1.2.28673

Which is a line card in slot 7 (output obtained with snmpwalk: snmpwalk -c COMMUNITY -On -v 2c -r 2 -t 10 IP_ADDRESS mib-2.47.1.1.1.1.2.28673)
.1.3.6.1.2.1.47.1.1.1.1.2.28673 = STRING: "10X10G-LC"

I know it is in slot 7 because it is the only one, if we had more how would i know?

What if i want to setup the monitoring system to monitor specific OIDs regarding this 28673 index?
First of all, can we suppose that the index 28673 indentifies the card across all the MIBs? or is it not the case?

How can somebody find the specific OIDs that relate to this index (card)

The device is an ONS 15454 DWDM, 

Thanks,