Query an OID before generating an Event

[Ramanan.Raveendran.1]

Hello,

 

I am currently receiving 'entPhysicalIndex (1.3.6.1.2.1.47.1.1.1.1.1)'  as part of the SNMP trap.

Step 1) I would want to read the 'entPhysicalClass (1.3.6.1.2.1.47.1.1.1.1.5)' OID with the instance of entPhysicalIndex received.

Step 2) Compare if it not equal to 2 (i.e. not a port)

Step 3) Generate another event for further processing.

 

i.e. I receive    1.3.6.1.2.1.47.1.1.1.1.1.7777    as part of the trap. Where 7777 is the index.

I would want to query   1.3.6.1.2.1.47.1.1.1.1.5.7777 OID and check if the return value is not equal to 2 and then raise an alarm accordingly.

 

Please note that, I would want to do this without a Catalog Update (i.e. without using Model Type Editor).

Would like to keep it to EventDisp changes.

 

Any pointers please.

Thanks for your time.

 

Regards

Ramanan

[Eleuthera Lewis]

You'll need to find the Spectrum Attribute this is stored it, and read from it using an event procedure. In the following code an interface index sent in a trap (U 1) is used to read from the ifAlias (0x11f84) attribute list.

 

I'm not sure if the one you're looking for is in a spectrum attribute by default.

 

  CreateEventWithVariables(                        \  
    {C CURRENT_MODEL},                             \  
    {H 0xfff00adf},                                \  
    SetEventVariable(                              \  
      GetEventVariableList(),                      \  
      {H 0x00012b4c},                              \  
      Append(                                      \  
        {S \"Secure MAC Violation on port: \"},    \  
        ToString(ReadAttributeInstance(            \  
          {C CURRENT_MODEL},                       \  
          {H 0x11f84},                             \  
          ToObjectId(GetEventVariable({U 1}))      \  
        ))                                         \  
      )                                            \  
    )                                              \  
  )

[Ramanan.Raveendran.1]

Many thanks lutelewis, for the reply.

 

Unfortunately, the Spectrum attribute was on a child model. I had to use 'GetModelsByRelationName' to get it done.

I have explained it below (just for reference / information).

 

• The trap comes into say....    'myDevice'.
• It has 'entPhysicalIndex' on {U 2}.   (example Index = 7777)
• I need to get the 'myDevice_EntityMIBApp' and then get to  entPhysicalClass's AttrID   under it.
• I am storing the value of entPhysicalClass.7777  in a new event variable {U 7}

 

$ ./show devices | grep myDevice

0x1f2cc40   myDevice       0x3d0002    GnSNMPDev

$

$ ./show children rel=Manages mh=0x1f2cc40

MHandle     MName                      MTypeHnd    MTypeName      Relation

...

0x1f2cc4e   myDevice_Standard RMON     0x590006    RMONApp        Manages

0x1f2cc47   myDevice_EntityMIBApp      0xc40055    RFC2737App     Manages

$

$ ./show attributes attr=0xc40aaf,iid=7777 mh=0x1f2cc47

Id          Name                    Iid          Value

0xc40aaf    entPhysicalClass        7777         8

 

Where:

0x10001  :   Modeltype_Handle's AttrID

0xc40055 :   RFC2737App's MTypeHnd (myDevice_EntityMIBApp)

0xc40aaf :   entPhysicalClass's AttrID   under RFC2737App

 

 

 

 

My EventDisp looks as follows and is working fine.

0xfff00046 E 20 P "ForEach( \

   GetModelsByRelationName({C CURRENT_MODEL}, {S \"Manages\"}, {C RELATION_SIDE_RIGHT}), \

   {Variable childMh}, {Variable notUsed}, {H 0}, \

      If ( Equals( {H 0xc40055} , ReadAttribute( {Variable childMh}, {H 0x10001}) ), \

         CreateEventWithVariables( {C CURRENT_MODEL}, {H 0xfff00040}, \

            SetEventVariable ( GetEventVariableList(), \

              {U 7}, ReadAttributeInstance(  {Variable childMh}, {H 0xc40aaf}, ToObjectId( GetEventVariable({U 2}) ) ) \

            ) \

         ) \

      , Nil() ) \

   )"

 

 

Explanation:

"GetModelsByRelationName({C CURRENT_MODEL}, {S \"Manages\"}, {C RELATION_SIDE_RIGHT})"   is equal to "./show children rel=Manages mh=0x1f2cc40"

 

"If ( Equals( {H 0xc40055} , ReadAttribute( {Variable childMh}, {H 0x10001}) )"  is to get the model id of 'myDevice_EntityMIBApp'.  Model Handle of  'myDevice_EntityMIBApp' will be stored in 'childMh'.

 

I am then creating a new Event '0xfff00040' with all the existing variables (GetEventVariableList()), along with the new variable {U 7} which reads '0xc40aaf :   entPhysicalClass's AttrID' with instance '7777' ({U 2} of original event)    from  'childMh'   (which is 'myDevice_EntityMIBApp' )