RE: MIB desgin problem.

Hi,

 

Is there any limitation on the number of columns in each row (in a table)? If so, how to calculate it so that the message can be sent properly?

 

Thanks & Best Regards,

Noppadon.

 

> Date: Fri, 24 Apr 2009 08:46:18 +0100
> Subject: Re: MIB desgin problem.
> From: [email protected]
> To: [email protected]
> CC: [email protected]
> 
> 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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