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Appendix A. Understanding SNMP
MIB
This is an index to the organized data within a network device.
It defines the operating parameters that can be controlled or
monitored. When requesting the network manager to retrieve
or modify a particular piece of information about a network
device, the network manager transmits the request to that net-
work device. The agent in that device interprets the incoming
request, performs the requested task, and sends its response to
the network manager. The network manager collects all the
data from the various network devices and presents it in a con-
sistent form.
Commands
Using SNMP Version 1, the network manager can issue three
types of commands: GetRequest, GetNextRequest, and
SetRequest.
GetRequest
This command retrieves a single item or the first in a series
from a network device.
GetNextRequest
This command retrieves the next item in a series from a net-
work device.
SetRequest
This command writes information to a network device.
Messages
The network device issues two types of messages:
GetResponse and Trap.
GetResponse
This message is the response to a network manager
GetRequest or GetNextRequest command.
A-2
TSU 120 User Manual
61202052L1-1
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