HP HSG Array Controller - Manual (Page 64)

3-30 StorageWorks Fibre Channel Storage Switch User's Guide
Compaq Confidential – Need to Know Required
Writer: Bill Reitz Project: StorageWorks Fibre Channel Storage Switch User's Guide Comments:
Part Number: AA-RHBYA-TE 135267-001 File Name: d-ch3 Managing the Switch Last Saved On: 4/7/99 11:59 AM
■ SNMP-BULKGET (SNMPv2C).
A manager can change management information on the agent. This operation
is termed SNMP-SET.
An agent can send information to the manager without being explicitly polled
for. This operation is termed a trap in SNMPv1 or a notification in SNMPv2C.
Traps or notifications would alert the manager to events that occur on the
agent system, such as reboot. For the rest of the document, the term trap is
used.
The information on an agent is known as the Management Information Base
(MIB). It is an abstraction of configuration and status information. A specific
type or class of management information is known as a MIB object or
variable. For example, the MIB variable,
sysDescr , defines the description
of an agent system. The existence of a particular value for a MIB object in the
agent system is known as a MIB object instance, or simply instance. Some
MIB objects have only a single instance for a given agent system. For
example, the system description and the instance is denoted as
sysDescr.0 .
Other MIB objects have multiple instances. For example, the operational status
of each Fibre Channel port on a Switch and a particular instance may be
denoted as
swFCPortOperStatus.5 ".
MIB objects are conceptually organized in a hierarchical tree structure. Each
branch in the tree has a unique name and numeric identifier (Figure 3-4).
Intermediate branches of the tree serve as a way to group related MIB objects
together. The leaves of the tree represent the actual MIB objects. Figure 3-4
illustrates the tree structure, with special attention to the Internet MIB tree and
the Fibre Channel MIB tree.