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SECTION VII
7.
SIMPLE NETWORK MANAGEMENT PROTOCOL
7.1 SNMP
INTRODUCTION
7.1.1
The TrueTime Network Time Server completely supports a SNMP version 1 agent with
the MIB II database. SNMP management software allows a network user to remotely
monitor and configure an IP (Internet) host that supports a SNMP agent. A SNMP agent
is protected from unauthorized use through a security authentication scheme. Further,
TrueTime has extended the MIB II database with its own custom enterprise MIB that
allows a manager more control than what is specified in the MIB II database.
7.1.2
We assume the reader has an understanding of SNMP because a complete introduction
to SNMP would fill many volumes of user manuals. If the reader is unfamiliar with
SNMP, pick up a copy of "SNMP, SNMPv2 and CMIP" written by William Stallings and
published by Addison-Wesley Publishing Company. This book is considered by the
Internet community to be the definitive introduction to SNMP. For more technical
references, see RFC 1157 (definition of SNMPv1), RFC 1213 (definition of MIB II) and
RFC 1354 (IP Forwarding table addition to MIB II). All RFCs are published with approval
by the Internet Activities Board and they are readily found on the Internet by running any
search engine and typing in the search field “RFC ####”. Some example WEB locations
of search engines are http://search.yahoo.com or http://www.altavista.digital.com.
7.2 SNMP
CONFIGURATION
7.2.1
SNMP offers a security authentication scheme that is based on a common password
shared by the management station and a group of agents. A group of hosts are known
as a community. Any management station or agent can be a member of any
combination of communities. Typically a manager will need to change the SNMP
community information from TrueTime’s SNMP agent factory defaults for security
purposes. However, the factory default SNMP community settings are chosen to make
the TrueTime SNMP immediately useable. TrueTime’s SNMP agent recognizes up to
five separate SNMP communities. These communities are configured through the serial
user port using the F36 string, the front panel keypad, or in the near future remotely
using SNMP and TrueTime’s Enterprise MIB. Each community has several configurable
parameters that are defined in the following table:
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