Conference azur::mcc

4079.0. "alarm rule software logic error detected" by CSC32::W_MCGAW () Thu Nov 12 1992 16:32

Hi

I have a customer getting the following mail message (intermittently)
which is generated by the alarm rule that follows the mail message.
I can not see anything wrong with the implementation of the alarm
rule.  Is there something I am missing or is it a possible bug?

Thanks,
Walt

Mail message text:

    Rule name:     Domain LOCAL_NS:.milwaukee Rule MKE-JFK_ErrorRate
Managed Object:    MCC 0 ALARMS RULE MKE-JFK_ErrorRate
    Domain:        Domain LOCAL_NS:.milwaukee
  Occurred at:     6-NOV-1992 11:19:55.90
     Category:     Data Circuit Transmission Problems
  Description:     MKE Router / Circuit from Lake Ronkonkoma, NY. / Interface 
                   Serial 5
     Severity:     Indeterminate
 
   Expression:     ( SNMP mke Interface 7 Inbound Error Packet Percent > .1,
                   for start=(+0:00) duration=00:05:00, at every=00:15:00 )
    Exception:     Software logic error detected
                   %MCC-S-SPECIALIZED_EXC, success with management 
                   module-specific exception reply

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

  Here is the output from 
  $ MANAGE /ENTERPRISE
  MCC>   show domain milwaukee rule MKE-JFK_ERRORRATE

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
DECmcc (V1.2.0)


Domain LOCAL_NS:.milwaukee Rule mke-jfk_Errorrate 
AT  6-NOV-1992 11:35:45 Characteristics

Examination of attributes shows:
                  Alarm Fired Procedure = DECMCC:[MCC]MCC_ALARMS_MAIL_ALARM.COM;
                                          1
              Alarm Exception Procedure = DECMCC:[MCC]MCC_ALARMS_MAIL_EXCEPTION.
                                          COM;1
                            Description = "MKE Router / Circuit from Lake 
                                          Ronkonkoma, NY. / Interface Serial 5"
                               Category = "Data Circuit Transmission Problems"
                            Batch Queue = "DECMCC_ALARM"
                 Alarm Fired Parameters = "@mcc_common:circuit_errors.dis"
                             Expression = ( SNMP mke Interface 7 Inbound Error 
                                          Packet Percent > .1,                  
                                            for start=(+0:00) 
                                          duration=00:05:00, at every=00:15:00 )
                               Severity = Minor
                         Probable Cause = Unknown

  There was a problem found in a wellfleet router .. when there are a lot
  of data requests on the router, it will return bad data to the SNMP AM.
  This bad data causes SNMP to return a 'Specialized Exception' to PA, 
  and then Alarms which displays the 'Software Logic Error: Specialized
  Exception'.

  Are there a lot of 'things' going on with this SNMP device ?  Like a lot
  of alarm rules and historian and exporter requests ?

  /keith

Hi Keith,

The box the customer is alarming against is a CISCO box.  I don't believe
there is a lot of activity going on with the box but I will check with
the customer to make sure.  I did ask the customer to to do an equivalent
SHOW SNMP command to see if any other error information can be obtained 
(this was requested by Stella Ko).  I also forgot to mention earlier that
this customer is using TGV Multinet IP transport.

Walt

  So the Wellfleet bug is out.

  In v1.2 there was a bug in PA which caused incorrectly architeched responses
  to be returned to the Alarms FM.  This pretty much means that *any* error
  which PA gets from the AM responsible for gathering counter data (in your
  case the SNMP AM) is incorrectly passed up the call chain; to Alarms.

  Alarms, receiving the ill-formed response gets confused, thus displaying the
  'software logic error, ...'

  The good news .. PA has been fixed for v1.3

  The bad news  .. I can not think of any workarounds for v1.2

  /keith

    Hi Keith,
    
    Well, at least I can tell the customer something.  He is out on
    vacation until 30-NOV-1992... Any chance of V1.3 shipping by then???
    
    Walt

>    Well, at least I can tell the customer something.  He is out on
>    vacation until 30-NOV-1992... Any chance of V1.3 shipping by then???

  DECmcc v1.3 *FIELD TEST* should be out soon ... but the SSB date isn't
  until January-93 I believe.

  /keith

Hi Keith,

I understand that is a MUP for BMS V1.2.  Is this something that would address
the problem we are seeing or is this for other issues?

Walt

RE: .6

> I understand that is a MUP for BMS V1.2.  Is this something that would address
> the problem we are seeing or is this for other issues?

  Walt - the v1.2 MUP will not contain the bug fixes to PA described in this
  note.  Sorry  8(

  /keith

And to avoid confusion, the MUP is called V1.2.3,
and I believe the SSB is shipping it as V1.2a