Chapter 6. SNMP Option
65
May 2011
6.2 Simple Network Management Protocol
6.2.1 SNMP Overview
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 ETU-01A are provided by an internal SNMP agent,
which utilizes out-of-band communication over standard 10/100BASE-T Ethernet. The SNMP
agent is compliant with the SNMPv1/v2C/v3 standards. SNMP communication uses the User
Datagram Protocol (UDP). UDP is a connectionless transport protocol, part of the IP suite. The
SNMP protocol is an asynchronous command/response polling protocol and operates at the OSI
Layer 7 (Layer 7 is the Application Layer. Other IP protocols 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).
All functions and settings accessible via the LCD or serial terminal connection of the ETU-
01A are also readable and settable via the Simple Network Management protocol.
6.2.2 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.
getBulkRequest Command for retrieving a block of management
information from the managed node. The managed
node responds with a getResponse message.
getBulkRequest was introduced in SNMPv2.
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.
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