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

Appendix B 81
Supported MIB Objects
Non-Standard HP Extended MIB Objects
Identification of OBJECT Instances for Use with the
SNMP
The names for all object types in the HP-MIB are defined explicitly
either in the Internet-standard MIB or in other documents which
conform to the naming conventions of the Structure of Management
Information (SMI). The SMI requires that conformant management
protocols define mechanisms for identifying individual instances of
those object types for a particular network element.
Each instance of any object type defined in the MIB is identified in
SNMP operations by a unique name called its “variable name.” In
general, the name of an SNMP variable is an OBJECT IDENTIFIER of
the form x.y, where x is the name of a non-aggregate object type defined
in the MIB and y is an OBJECT IDENTIFIER fragment that, in a way
specific to the named object type, identifies the desired instance.
The type-specific naming of object instances is defined below for a
number of classes of object types. Instances of an object type to which
none of the following naming conventions are applicable are named by
OBJECT IDENTIFIERs of the form x.0, where x is the name of said
object type in the MIB definition.
For example, suppose one wanted to identify an instance of the variable
sysDescr in the Internet-standard MIB. The object class for sysDescr
would look like:
iso org dod internet mgmt mib system sysDescr
136 1 2 1 1 1
Hence, the object type, x, would be 1.3.6.1.2.1.1.1 to which is
appended an instance sub-identifier of 0. That is, 1.3.6.1.2.1.1.1.0
identifies the one and only instance of sysDescr.
ieee8023MacTable Object Type Names
The name of an ethernet-like interface, s, is the OBJECT IDENTIFIER
value of the form i, where i has the value of that instance of the
ifIndex object type associated with s.
For each object type, t, for which the defined name, n, has a prefix of
ieee8023MacTableEntry, an instance, i, of t is named by an OBJECT
IDENTIFIER of the form n.s, where s is the name of the ethernet-like
interface about which i represents information.
For example, suppose one wanted to identify the instance of the
variable ieee8023MacNotTransmitted, associated with interface 2.
Accordingly, ieee8023MacNotTransmitted.2 would identify the
desired instance.