SNMP Manager Programmer's Guide

Constructing and Interpreting Packets
SNMP Manager Programmer’s Guide–134249
5-6
Instance Identifiers
The MIB description for a table identifies the table’s index object, which is one or more
of the objects in each table entry. For example, the zhrmDevUnTable in the Host
Resources Subagent’s MIB is defined as a sequence of entries consisting of six MIB
objects, one of which (zhrmDevUnIndex) is the index object:
zhrmDevUnTable OBJECT-TYPE
SYNTAX SEQUENCE OF ZhrmDevUnEntry
...
zhrmDevUnEntry OBJECT-TYPE
SYNTAX ZhrmDevUnEntry
...
INDEX { zhrmDevUnIndex }
::= { zhrmDevUnTable 1 }
ZhrmDevUnEntry ::= SEQUENCE {
zhrmDevUnIndex INTEGER,
zhrmDevUnType OBJECT IDENTIFIER,
zhrmDevUnDescr DisplayString,
zhrmDevUnID OBJECT IDENTIFIER,
zhrmDevUnStatus INTEGER,
zhrmDevUnErrors Counter
}
To identify a particular instance of zhrmDevUnType, you would specify the OID of
zhrmDevUnType followed by the index value of the entry you are interested in. The
OID of zhrmDevUnType is 1.3.6.1.4.1.169.3.180.3.6.1.2:
iso (1)
org (3)
dod (6)
internet (1)
private (4)
enterprises (1)
tandem (169)
nonstopsystems (3)
zhrm (180)
zhrmDevUnavail (3)
zhrmDevUnCurrTime (1)
...
zhrmDevUnTable (6)
zhrmDevUnEntry (1)
zhrmDevUnIndex (1)
zhrmDevUnType (2)
...
zhrmDevUnErrors (6)
The value of zhrmDevUnIndex is an integer having the same value as one of the
hrDeviceIndex values (hrDeviceIndex is an object in the subagent’s hrDevice group). If
you want to retrieve the value of zhrmDevUnType for a zhrmDevUnTable entry with an
zhrmDevUnIndex value of 10002, you would identify the object’s instance like this:
1.3.6.1.4.1.169.3.180.3.36.1.2.10002