Cisco WS-C2950-24 Configuration Manual page 104

SNMP Network Management Platforms
An example of an NMS is the CiscoWorks network management software.
CiscoWorks2000 software uses the switch MIB variables to set device variables
and to poll devices on the network for specific information. The results of a poll
can be displayed as a graph and analyzed to troubleshoot internetworking
problems, increase network performance, verify the configuration of devices,
monitor traffic loads, and more.
As shown in
repository for information about device parameters and network data. The agent
can send traps, or notification of certain events, to the SNMP manager, which
receives and processes the traps. Traps are messages alerting the SNMP manager
to a condition on the network such as improper user authentication, restarts, link
status (up or down), and so forth. In addition, the SNMP agent responds to
MIB-related queries sent by the SNMP manager in get-request, get-next-request,
and set-request format.
The SNMP manager uses information in the MIB to perform the operations
described in
Figure 4-1
SNMP Manager
Table 4-1
Operation
get-request
get-next-request Retrieves a value from a variable within a table.
get-response
set-request
trap
1. With this operation, an SNMP manager does not need to know the exact variable name. A
Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
4-8
Figure 4-1, the SNMP agent gathers data from the MIB, which is the
Table 4-1.
SNMP Network
Get-request, Get-next-request,
NMS
Get-bulk, Set-request
Get-response, traps
SNMP Operations
Description
Retrieves a value from a specific variable.
Replies to a get-request, get-next-request, and set-request sent
by an NMS.
Stores a value in a specific variable.
An unsolicited message sent by an SNMP agent to an SNMP
manager indicating that some event has occurred.
sequential search is performed to find the needed variable from within a table.
Chapter 4 General Switch Administration
Network device
MIB
SNMP Agent
1
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