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464 AlterPath KVM/net Installation, Administration, and User’s Guide
Object Identifiers (OID) The SNMP manager or the management application uses a well-
defined naming syntax to specify the variables to the SNMP
agent. Object names in this syntax are called Object Identifiers
(Object IDs or OIDs). OIDs are series of numbers that uniquely
identify an object to an SNMP agent. OIDs are arranged in a
hierarchical, inverted tree structure.
The OID tree begins with the root and expands into branches.
Each point in the OID tree is called a node and each node will
have one or more branches, or will terminate with a leaf node.
The format of OID is a sequence of numbers with dots in
between.
There are two roots for Object Identifiers, namely iso and ccit. iso
starts with.1 and ccit starts with.0. Most Object Identifiers start
with.1.3.6.1, where 1=iso, 3=org, 6= dod,
1 = internet. The Internet sub-tree branches into mgmt and
private.
To understand the concept of relative and absolute Object
Identifiers, let us consider the AdventNet Object
Identifier.1.3.6.1.4.1.2162. It specifies the path from the root of
the tree. The root does not have a name or a number but the initial
1 in this OID is directly below root. This is called an absolute
OID. However, a path to the variable may be specified relative to
some node in the OID tree. For example, 2.1.1.7 specifies the
sysContact object in the system group, relative to the Internet
(.1.3.6.1) node in the OID tree. This is called a relative OID.
OID See Object Identifier
OOBI
Out-of-Band Infrastructure, an integrated systems approach to remote
administration.
Consists of components that provide secure,
alternate path to connect to and manage an organization’s
production network remotely.
OSD On-Screen Display.
Packet A packet is a basic communication data unit used when
transmitting information from one computer to another. The