Teledyne HPAC-2005, Operation Manual

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126 205356 REV T 3 RU SSPA Chassis Operations Manual
A SNMP-managed network consists of three primary components: managed devices,
agents, and management systems. A managed device is a network node that contains
a SNMP agent and resides on a managed network. Managed devices collect and store
management information and use SNMP to make this information available to manage-
ment systems that use SNMP. Managed devices include routers, servers, switches,
bridges hubs, computer hosts, and printers.
An agent is a software module that has local knowledge of management information
and translates that information into a form compatible with SNMP: the Management
Information Base (MIB). The agent can send traps, or notification of certain events, to
the manager. Essentially, a Teledyne Paradise Datacom SSPA is considered a “SNMP
agent”.
A manager is a software module that listens to the SNMP notifications sent by SNMP
agents. The manager can also send requests to an agent to collect remote information
from the Management Information Base (MIB).
The communication between the agent and the manager uses the SNMP protocol,
which is an application of the ASN.1 BER (Abstract Syntax Notation 1 with Basic En-
coding Rules), typically over UDP (for IP networks).
•
Version 1
(SNMPv1, described in RFC 1157) is the initial implementation
of SNMP.
•
Version 2
(SNMPv2c, described in RFC 1902) is the second release of
SNMP. It provides additions to data types, counter size, and protocol op-
erations.
•
Version 3
(SNMPv3, described in RFC 2271 through RFC 2275) is the
most recent version of SNMP.
SNMP V1
SNMP version 1 (SNMPv1) is the initial implementation of the SNMP protocol.
SNMPv1 operates over protocols such as User Datagram Protocol (UDP), Internet
Protocol (IP), OSI Connectionless Network Service (CLNS), AppleTalk Datagram-
Delivery Protocol (DDP), and Novell Internet Packet Exchange (IPX). SNMPv1 is wide-
ly used and is the de-facto network-management protocol in the Internet community.
The Teledyne Paradise Datacom SSPA family of products utilizes the most popular im-
plementation, SNMP V1 over UDP transport layer.
SNMP V2
SNMPv2 (RFC 1441–RFC 1452) revises version 1 and includes some improvements
in the areas of performance, security, confidentiality, and manager-to-manager com-
munications. It introduced GetBulkRequest, an alternative to iterative GetNextRe-
quests for retrieving large amounts of management data in a single request.