Very Computer

by **Liang J** » Wed, 09 May 2001 10:19:29

Is the SNMP data type "object id" actually the MIB-2 object sysObjectID? and what is its value indeed?

by **dperk..** » Sat, 12 May 2001 06:34:59

HI,

It looks like Brian was trying to simplify the answer, and I believe,
went too far.

In SNMP, and OBJECT IDENTIFIER is a data type. Another data type
in SNMP is Integer32. The values of data type OBJECT IDENTIFIER
are object identifer values. An object identifier value in SNMP
is a sequence of between 2 and 128 non-negative integers.

The data type for MIB object type sysObjectId is OBJECT IDENTIFIER,
and, thus, its value is an object identifier value.

Regards,
/david t. perkins

> > Is the SNMP data type "object id" actually the MIB-2 object sysObjectID? and what is its value indeed?

> objectid is a series of octets. its that simple.

> it can be used for many things. the 'sysOID' is an octet string that will
> describe something about the hardware or agent that is running. think of
> OIDs as '#defines' in C, sort of like:

> #define "some.long.path.that.is.unique.to.my.mib" "version 1.23 of chassis xyz"

> (well, taken loosely) ;-)

> so when you get an OID returned, you have to refer to the mib to see what its
> 'pointing' to. usually in a vendor mib there are sections that talk about
> software agents, hardware types, etc. usually when that agent is queried
> it will have a sysOID that can be compared against a known table (at the
> NMS) and perhaps the appropriate icon on a map would be chosen.

> but the OID =type= is not the same thing as the sysOID =variable=. one is
> an example of the other.

> --
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