Creating the driver

First, you create a driver that sets up the process of querying the MIB for the value of SM_SerialNumber.

A driver is an instance of the GA_Driver class, and is composed of three parts:

• Front End — The source of the input (defined by the ReadsInputFrom attribute of the GA_Driver class).

• Rule Set — The ASL script that parses through the input string to determine the values of the attributes (defined by the ReadsRulesFrom attribute of the GA_Driver class).

• Back End — The repository where the attribute values that are parsed from the input string are stored.

  In this example, the back end is the Manager that is started with the sm_server command and loads the import file. The value for the root OID in this example is for a Cisco router, Cisco chassis-id MIB (3).

  To create an import file:

  1. Start editing the import file.

     t # 
     		
                          BASEDIR
                          /smarts/bin/sm_edit --create
                          
                           conf/discovery/DISCOVERY_serialNumber.imports
     

  2. Type the following lines into the DISCOVERY_serialNumber.importfile:

                           GA_Driver::DynModel-SerialNumber-Driver {
                            ReadsInputFrom = SNMP_WalkFE::DynModel-SN-FrontEnd
                            {
                             retries =5
                             rootOIDs = {
                               { 10, ".1.3.6.1.4.1.9.3.6.3" }
                             }
                             trace=FALSE
                            }
                          
                            ReadsRulesFrom = GA_RuleSet::DynModel-SN-RuleSet
                            { fileName = "discovery/dynmodel-sn.asl" 
                             trace=FALSE}
                          
                          
                           waitForCompletion =TRUE
                          }
                       

  3. Save and close the DISCOVERY_serialNumber.import file.

     The DISCOVERY_serialNumber.import file is saved into the BASEDIR/smarts/local/conf/discovery directory.

     In this import file, an instance of the GA_Driver class is created, named DynModel-SerialNumber-Driver. Since an OID is queried for its value, a SNMP_WalkFE front end is used. The SNMP_WalkFE instance, DynModel-SN-FrontEnd:

• Retrieves all of the MIB objects under a set of root OIDs.

• Converts the values to ASCII and markers.

• Passes them to the ASL file that is defined to parse the input..

  In this import file, the ASL file is defined by the ReadRulesFrom attribute as discovery/dynmodel-sn.asl.