APC 78-10169-02 Computer Monitor User Manual


 
Chapter 2 Monitoring the System
SNMP Basics
2-12
Cisco ICS 7750 Administration and Troubleshooting Guide
78-10169-02 Rev. B0
The following system components, though not SNMP-managed devices, receive
SNMP support through ICS System Manager:
System alarm processor (SAP) card
Power supply modules
Fans
Chassis
SNMP Management Information Base
A Management Information Base (MIB) is a collection of information that is
organized hierarchically. MIBs are accessed using a network management
protocol such as SNMP. They comprise managed objects, which are identified by
object identifiers.
A managed object (sometimes called a MIB object or an object) is one of any
number of specific characteristics of a managed device. Managed objects
comprise one or more object instances, which are essentially variables.
Using SNMP with MIB Variables
System MIB variables are accessible through SNMP as follows:
Accessing a MIB variable—This function is initiated by the SNMP agent in
response to a request from the NMS. The agent retrieves the value of the
requested MIB variable and responds to the NMS with that value.
Setting a MIB variable—This function is also initiated by the SNMP agent in
response to a message from the NMS. The SNMP agent changes the value of
the MIB variable to the value requested by the NMS.
Instead of defining a large set of commands, SNMP places all operations in a
get-request, get-next-request, and set-request format. For example, an SNMP
manager can get a value from an SNMP agent or store a value in that SNMP agent.