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Appendix A. Understanding SNMP
A-2 TSU 600 User Manual 61202076L1-1
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 re-
questing the network manager to retrieve or modify a particular piece of
information about a network device, the network manager transmits the
request to that network device. The agent in that device interprets the in-
coming 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 consistent form.
Commands
Using SNMP Version 1, the network manager can issue three types of
commands: GetRequest, GetNextRequest, and SetRequest.
Message
The network device issues two types of messages:
GetResponse and Trap.
Command Description
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 network device.
SetRequest This command writes information to a
network device.
Command Description
GetResponse This message is the response to a network man-
ager GetRequest or GetNextRequest command.
Tr a p This is an unsolicited message issued by a net-
work device to report an operational anomaly or
an alarm condition to the network manager. These
messages are typically encased within informa-
tional packets and transported over the LAN or
WAN (wide area network).