
SNMP Introduction
©2008 Allied Telesis Inc. All rights reserved.
Software Version 5.2.1
AlliedWare Plus
TM
Operating System Software Reference C613-50003-00 REV E
54.11
SNMP Communities (Version v1 and v2c)
A community is a relationship between an NMS and an agent. The community name is used
like a password for a trivial authentication scheme. Both SNMPv1 and SNMPv2c provide
security based on the community name only. The concept of communities does not exist for
SNMPv3, which instead provides for a far more secure communications method using entities,
users, and groups.
Important We strongly recommend removing community membership from all SNMPv3
configured devices to prevent access to them via SNMPv1 and SNMv2c, which could bypass
the additional SNMPv3 security features.
SNMPv3 Entities
Entities comprise one of the basic components of the SNMPv3 enhanced architecture. They
define the functionality and internal structure of the SNMP managers and agents. An in-depth
description of entities can be found in RFC 3411, on which the following text is based. SNMPv3
defines two entity types, a manager and an agent. Both entity types contain two basic
components: an SNMP engine and a set of applications.
SNMP Engine
The engine provides the basic services to support the agents component applications, in this
respect it performs much of the functionality expected of the ISO Session and Presentation
layers. These functions include, message transmission and reception, authentication and
encryption, and access control to its managed objects database (MIB). The SNMP engine
comprises the following components:
■
Dispatcher
■
Message processing Subsystem
■
Security Subsystem
■
Access Control Subsystem
The only security subsystem presently supported is the user based security model (USM).
Each SNMP engine is identified by an snmpEngineID that must be unique within the
management system. A one to one association exists between an engine and the entity that
contains it.
Entity Applications
The following applications are defined within the agent applications:
■
Command Generator
■
Notification Receiver
■
Proxy Forwarder
■
Command Responder
■
Notification Originator
■
Other
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