Re: an additional number of oid in tutorial: NET-SNMP-TUTORIAL-MIB

2009/2/11 Alexander Bubnov <[email protected]>:
> Tutorial: http://www.net-snmp.org/wiki/index.php/TUT:Writing_a_Subagent.
>
> Registration example from that tutorial:
>
>   void
> init_nstAgentSubagentObject(void)
> {
>   oid nstAgentSubagentObject_oid[] =
>   { 1, 3, 6, 1, 4, 1, 8072, 2, 4, 1, 1, 2, 0 };
>
> ...
> }
>
> notice above an additional number is 0 at the end of oid declaration. Let me
> know please why so?

This code is registering an *instance* of the (scalar) object
nstAgentSubagentObject.
(Note that the code used to register the OID is
"netsnmp_register_int_instance()"

If the object is registered as a full scalar object, then you'd omit the final 0
(and the registration would handle both valid and invalid instances).




> I can see declartion of nstAgentSubagentObject in mib without any additional
> numbers:
>
> nstAgentSubagentObject OBJECT-TYPE
                :
>   ::= { nstAgentModules 2 }

That is defining the MIB *object*.
The agent will always return the OID of an *instance* of this object.
For a scalar object, this involves adding an extra '0'.

See any SNMP book for more details.

Dave

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