Re: Floating point numbers representation in SNMP

On 16/07/07, Ansa Ahammed <[email protected]> wrote:
> Which data type can we use to represent floating-point nubers
> in Snmp .

The SNMP standard does not strictly include support for
non-integer numeric values.   If you need to implement a
fractional value, there are three options:

  a)  Define the object as a fixed-point decimal value,
       and use an INTEGER-based syntax (with an
       implicit decimal point).   For example, sysUpTime
       is measured in "centiseconds", thus representing
       a floating point value to two decimal places.

  b)  Use a String-based value to contain a printable version
       of the value you wish to represent.   The client application
       would then need to parse this back into a floating point value.

  c)  Use the OPAQUE type to wrap the floating point value
       in a form that can be transferred using SNMP.  The client
       library would then unwrap this to recover the original value.
       This approach is used for the Net-SNMP syntax Float.
       It works seamlessly for Net-SNMP-based applications, but
       would typically not be recognised by any other SNMP toolkit.


See the MIB group UCD-SNMP-MIB::laTable for example of all
three of these approaches.

Dave

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