Re: mib2c usage on tables (bad tables!)

On 07/03/07, Joao Miguel Ferreira <[email protected]> wrote:
> About this piece of code generated by mib2c what is the usage/meaning of
> min_column and max_column ??

'min_column' is the column number of the first (accessible) column in the
table, and 'max_column' is the column number of the last column.

For example, sysORTable (in SNMPv2-MIB) is defined as:

SysOREntry ::= SEQUENCE {
    sysORIndex     INTEGER,
    sysORID        OBJECT IDENTIFIER,
    sysORDescr     DisplayString,
    sysORUpTime    TimeStamp
}

with
    sysORID OBJECT-TYPE....  ::= { sysOREntry 2 }
&
    sysORUpTime OBJECT-TYPE....  ::= { sysOREntry 4 }

so   min_column=2 and max_column=4

(Note that sysORIndex is defined as "not-accessible", which
is why min_column isn't 1)


> This is part of the table initialization code.... Am I compromising the
> future possible growth of the table or this is only for initialization
> purposes ?

This doesn't affect the number of *rows* in the table - just the
number of columns.   If the definition of the table changes, then
you'd have to update these values.  But you'd need to add code
to handle the new columns anyway.


> Put it another way: if I simply do not initialize it (ex: max=0, min=0)
> would the subsequent procedures work ?

No.
The agent wouldn't know which columns were valid.

Dave

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