RAD Data comm ASMI-450 - Manual (Page 106)

SNMP Management
B-2 ASMi-450 Installation and Operation Manual
B.2 SNMP Environment
General The SNMP management functions of the ASMi-450 are provided by an internal
SNMP agent, which is communicate through the ASMi-450 control port using
the Serial Link Internet Protocol (SLIP).
The SNMP management communication uses the User Datagram Protocol
(UDP). UDP is a connectionless-mode transport protocol, part of the suite of
protocols of the Internet Protocol (IP).
Note
Telnet management uses the TCP protocol over IP for management
communication. After a Telnet session is started, the management interface is
similar to that used for the supervision terminal (Chapter 3).
This section covers the information related to the SNMP environment. For a
description of the IP environment, refer to Section B-3.
SNMP Principles The SNMP management protocol is an asynchronous command/response polling
protocol: all the management traffic, except for trap messages, is initiated by the
SNMP-based network management station, which addresses the managed
entities in its management domain. Only the addressed managed entity answers
the polling of the management station.
The managed entities include a function called an “SNMP agent”, which is
responsible for interpretation and handling of the management station requests
to the managed entity, and the generation of properly-formatted responses to the
management station.
SNMP Operations
The SNMP protocol includes four types of operations:
getRequest Command for retrieving specific management
information from the managed entity. The managed entity
responds with a getResponse message.
getNextRequest Command for retrieving sequentially specific
management information from the managed entity. The
managed entity responds with a getResponse message.
setRequest Command for manipulating specific management
information within the managed entity. The managed
entity responds with a setResponse 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 entity.