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banana - This the the graphtype variable set in the Model-Some-switch.nmis file. This sets the name of the graph that NMIS will invoke for a particular RRD file. In order for the graph heading to be correct this variable with its associated description needs to be added to the Common-heading.nmis file.
elephant - This is the name of the RRD file that the data retrieved via SNMP will be written to. This variable is set in the Model-Some-switch.nmis file. It must also be referenced in the Common-database.nmis file in order for the RRD to be created and updated in the correct directory. This variable is referenced in the Common-stats.nmis file in order for NMIS to know where to find statistical data.
zebra - This is specific to an SNMP OID and is set in the Model-Some-switch.nmis file. This will be the 'DS' (Data Source) title within the RRD file that will contain the actual data returned for a specific OID. This variable is referenced in the Common-stats.nmis file in order to provide the DS for the specific data that needs to be presented.
giraffe - This variable is set in the Common-stats.nmis file. It is used to make computations on the zebra variable in the RRD language. This variable is then passed to the Common-threshold.nmis file in order to fire and event.