Re: MIB desgin problem.

2009/4/24 Noppadol Sotanakul <[email protected]>:
> Could you please help me verify this part of MIB if it is valid or not?

No - it is not.

There are two main problems.
Firstly, your main table is too deep:

   abcTable.abcEntry.abc.aaa

is not allowed.   The column objects must
be the *immediate* children of the Entry object,
and they cannot in turn have children themselves.

Try something like:

>  AbcEntry ::= SEQUENCE {
>  instance   OCTET STRING,
>       aaa     OCTET STRING,
>       bbb     OCTET STRING,
>  }

with
    aaa ::=  { abcEntry 2 }
    bbb ::=  { abcEntry 2 }

(and drop 'abc' altogether)


> In fact, there is a 'ccc' table in 'abc' table

That is also not allowed.
Tables can *only* contain leaf column objects.

You'll need to define the second table separately,
but re-use the "instance" value as an index.
i.e.
>  cccTable   OBJECT-TYPE
>    SYNTAX   SEQUENCE OF CccEntry
              :
>    ::= { nnn 2 }
>
>  cccEntry   OBJECT-TYPE
>    SYNTAX   CccEntry
              :
>    INDEX { instance, name }
>    ::= { cccTable 1 }

The definition of CccEntry can stay the same.
(It doesn't need to contain 'instance')

Two final points:

   -   the index objects ('instance' and 'name')
          should be defined as "not-accessible"

   -   column object names conventionally use
          a common prefix, typically based on the
          name of the table.

So these should probably be something like

    abcInstance,   abcAaa,   abcBbb
    cccName, cccId, cccState

This is particularly important for "common" names
such as "name", "id" and "status", which could easily
appear elsewhere in the MIB tree.


Dave

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