HP SNMP/XL User's Guide (36922-90036)

Chapter 1 17
Introduction to HP SNMP/XL
Concepts and Definitions
For example the sysDescr Object Identifier is represented as
1.3.6.1.2.1.1.1.0. (The 0 added at the end is an instance
sub-identifier. This means the one and only instance of sysDescr.) This
Object Identifier structure is shown in Figure 1-2.
Figure 1-2 Simple Object Identifier
Under the internet subtree there are four subtrees.
1. The directory subtree(1) is reserved for the OSI directory in the
Internet.
2. The mgmt subtree(2) is used to identify objects which are defined in
documents approved by the Internet Activities Board (IAB). At
present, this includes only one subtree, mib.
3. The experimental subtree(3) is used to identify objects used in
Internet experiments. If an experiment is successful, it will be
moved over into the Internet-standard MIB.
4. The private subtree(4) is used to identify objects that are defined
privately and not standardized. At present, this includes only one
subtree, enterprises, where vendor-specific objects are registered.
Syntax The syntax of an object defines the abstract data structure for
that object type. It determines how a value is displayed according to
ASN.1.
Definition The definition describes the meaning of the object type.