RAD Data comm ASMI-450 operation manual Snmp Environment, General Snmp Principles, Snmp Operations

SNMP Management

B.2 SNMP Environment

General

SNMP Principles

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.

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.

B-2 ASMi-450 Installation and Operation Manual