Lecture 23: Network Management #3

Instance Specification

The MIB specifies the structure of managed information. A particular instance of a piece of information in a managed node (that is, the actual value of a specified variable) is specified by appending a zero sub-identifier to the OBJECT IDENTIFIER, thus:

If the particular information is not a column in a table (ie, it is a scalar), then the OBJECT IDENTIFER is given a suffix of zero, thus:
system.sysDescr.0
or
.1.3.6.1.2.1.1.1.0
The meaning of this "instance information" is that it is the value of the OID "system.sysDescr" -- in other words, the actual octet (byte) string describing the managed node. To retrieve the instance information specified here, we could use (imaginary syntax :-):
get system.sysDescr.0 
or
get 1.3.6.1.2.1.1.1.0 
Note that this syntax is simply for illustration purposes: you can't (for example) type these lines to a command interpreter.

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