Allied Telesis AT-S63 - Manual (Page 318)

Chapter 18: SNMPv3
318 Section II: Advanced Features
SNMPv3 Overview
The SNMPv3 protocol builds on the existing SNMPv1 and SNMPv2c
protocol implementation which is described in Chapter 4, ”SNMPv1 and
SNMPv2c” on page 79. In SNMPv3, User-based Security Model (USM)
authentication is implemented along with encryption, allowing you to
configure a secure SNMP environment.
In addition, SNMP terminology changes in the SNMPv3 protocol. In the
SNMPv1 and SNMPv2c protocols, the terms agent and manager are used.
An agent is an SNMP user while a manager is an SNMP host. In the
SNMPv3 protocol, agents and managers are called entities. In any
SNMPv3 communication, there is an authoritative entity and a non-
authoritative entity. The authoritative entity checks the authenticity of
the non-authoritative entity. And, the non-authoritative entity checks
the authenticity of the authoritative entity.
With the SNMPv3 protocol, you create users, determine the protocol
used for message authentication as well as determine if data transmitted
between two SNMP entities is encrypted. In addition, you can restrict
user privileges by determining the user’s view of the Management
Information Bases (MIB). In this way, you restrict which MIBs the user can
display and modify. In addition, you can restrict the types of messages,
or traps, the user can send. (A trap is a type of SNMP message.)
After you have created a user, you define SNMPv3 message notification.
This consists of determining where messages are sent and what types of
messages can be sent. This configuration is similar to the SNMPv1 and
SNMPv2c configuration because you configure IP addresses of trap
receivers, or hosts. In addition, with the SNMPv3 implementation you
decide what types of messages are sent.
Note
For the SNMP RFCs supported by this release of the AT-S63 software,
see ”SNMP Management Session” on page 35.
This section further describes the features of the SNMPv3 protocol. The
following subsections are included:
❑ ”SNMPv3 Authentication Protocols” on page 319
❑ ”SNMPv3 Privacy Protocol” on page 319
❑ ”SNMPv3 MIB Views” on page 320
❑ ”SNMPv3 Storage Types” on page 321
❑ ”SNMPv3 Message Notification” on page 321