CTC Union FMUX-01, User Manual

Page: 49 / 59

Chapter 6. SNMP Operation
6-1
FMUX-01Mar 2003
6.1 General
The Simple Network Management Protocol (SNMP) is one of many protocols in the
Internet Protocol (IP) suite. SNMP is the protocol recommended specifically for the
exchange of management information between hosts residing on IP networks. Network
management allows you to monitor and control network devices remotely using
conventional computer network technology.
The SNMP management functions of the
MULTIPLEXER UNIT
are provided by an
internal SNMP agent, which utilizes out-of-band communication over standard 10Base-T or
100Base-TX Ethernet. The SNMP agent is compliant with the SNMPv1 standard. SNMP
communication uses the User Datagram Protocol (UDP). UDP is a connectionless transport
protocol, part of the IP suite. The SNMP application uses an asynchronous
command/response polling protocol and operates at the OSI Layer 7 (Layer 7 is the
Application Layer. Other IP applications that operate at this layer are FTP, Telnet, SMTP,
etc.). All management traffic is initiated by the SNMP-based network management station.
Only the addressed managed entity (agent) answers the polling of the management station
(except for trap messages).
6.2 SNMP Operations
The SNMP protocol includes four types of operations:
getRequest Command for retrieving specific value of an "instance"
from the managed node. The managed node responds
with a
getResponse message.
getNextRequest Command for retrieving sequentially specific
management information from the managed node.
The managed node responds with a
getResponse
message.
setRequest Command for manipulating the value of an "instance"
within the managed node. The managed node responds
with a
getResponse message.
trap Management message carrying unsolicited
information on extraordinary events (that is, events
which occurred not in response to a management
operation) reported by the managed node.