User`s guide

Introduction
QMS CrownNet System Administrator's GuideC-2
Introduction
This chapter first provides a brief overview of SNMP, and then it dis-
cusses several TCP/IP concepts, including subnetting and subnet
masks, internet routing and gateways, and Class A, B, and C, Internet
addresses. Terms are defined in the glossary.
SNMP
A manageable network is composed of one or more Network Man-
agement Stations (NMSs) and a group of agents. The NMSs are sys-
tems responsible for managing the network; an agent is software or a
networked device that forwards information to the NMSs. With the
CrownNet interface daughterboard installed, your printer performs the
functions of an agent.
SNMP (Simple Network Management Protocol), part of the suite of
Internet protocols, is a standard message-handling protocol used to
monitor internet networks and gateways. SNMP allows each NMS to
access management information (such as job, bin, interface, emula-
tion) on an agent and, in some instances, to change that information.
Each request by an NMS for information on an agent is accompanied
by a community name, and a password that allows the manager
access to that information. All of the management information avail-
able on an agent is referred to as the Management Information Base
(MIB).
The QMS agent is RFC 1157 compliant. Therefore, it supplies infor-
mation according to the MIB-II definition.
Traps
While an NMS usually explicitly requests information from an agent,
agents can also send information to a manager without an explicit
request. This is called trapping. Traps are unsolicited, asynchronous
messages from agents to NMSs. They alert the NMS to changes that