HP Surestore 64 HP Surestore Director FC-64 SNMP Support Manual - Page 11

Variables In a Managed Device

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Introduction to SNMP Variables In a Managed Device Variables are the means by which a director and other devices keep track of their performance, control their own performance, and provide access to their performance for network managers. A simple example of a variable's use is to turn off a port (set the variable to 2), or turn the port back on (set the variable to 1). Some variables just hold values that indicate status (for example error counts). SNMP allows the network managers to have access to some of the same variables for network management. For purposes of the following explanation, an object is a data variable that represents some resource or other aspect of a managed device. An agent is the entity that interfaces to the actual object being managed (Figure 2 on page -6). The agent understands the language of SNMP and translates between the manager and the object. Objects must be retrieved and/or modified by the manager, and it is the agent's job to identify and make available the correct object. Within the agent is at least one, maybe several, collections of definitions called Management Information Bases (MIBs). Standard MIBs, available with SNMP, provide standard definitions for the variables within the managed object that are used for network monitoring and management. When a managed object supports a standard MIB, it agrees to provide and make available the applicable variables listed in the standard MIB. 5

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5
Introduction to SNMP
Variables In a Managed Device
Variables are the means by which a director and other devices keep track of their
performance, control their own performance, and provide access to their performance for
network managers. A simple example of a variable
’
s use is to turn off a port (set the
variable to 2), or turn the port back on (set the variable to 1). Some variables just hold
values that indicate status (for example error counts). SNMP allows the network
managers to have access to some of the same variables for network management.
For purposes of the following explanation, an object is a data variable that represents
some resource or other aspect of a managed device.
+RZ±6103±&KDQJHV±9DULDEOHV±³2EMHFWV´±LQ±D±0DQDJHG±'HYLFH
An agent is the entity that interfaces to the actual object being managed (Figure 2 on
page -6). The agent understands the language of SNMP and translates between the
manager and the object. Objects must be retrieved and/or modified by the manager, and
it is the agent
’
s job to identify and make available the correct object. Within the agent is at
least one, maybe several, collections of definitions called Management Information Bases
(MIBs). Standard MIBs, available with SNMP, provide standard definitions for the
variables within the managed object that are used for network monitoring and
management. When a managed object supports a standard MIB, it agrees to provide and
make available the applicable variables listed in the standard MIB.