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嵌入式WebServer架构.pdf
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更新于2023-03-03
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Embedded Web Server Architecture for Web-based Element and Network Management
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Embedded Web Server Architecture
for Web-based Element and Network
Management
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ABSTRACT
Our research work focuses on Web technology for building a scalable and
efficient network management environment. Web technology has been employed
in network management for a number of years and nowadays it is accepted as a
proven technology in network management area. However the usage of the
technology was limited in areas of accessing and presenting information. Web
technology is useful not only for simple and effective user interface but also for
building key components in network management applications, such as data
processing, analyzing and distribution. In the light of recent advancement of Web
technology, there are many available opportunities for solving most of
management problems of evolving network, comparing the capabilities of the
traditional management framework with Web-based network management.
Web-based element management gives an administrator the ability to
configure and monitor network devices over the Internet using a Web browser.
The most direct way to accomplish this is to embed a Web server (EWS) into a
network device and use that server to provide a Web-based management user
interface. In this dissertation, we present the design and implementation of a Web-
based element management architecture. The architecture provides basic interface
mechanisms for use between a management application of an embedded system
and an EWS. An integration mechanism between a Web document and a
management application enables developers to add new management
functionalities by merging Web documents with management application
programs that generate dynamic management information. For rapid and low cost
development, an easy but powerful integration mechanism must be provided. We
suggest effective integration mechanisms for each interface mechanisms. We
validate the effectiveness of Web-based element architecture by developing Web-
based management user interface for commercial Internet router.
We then extend the Web-based element management architecture to
support the Web-based network management, which provides a network-wide
view of management information: managing the state of network link, topology
and policies as well as the network elements. As to extending the architecture, we
apply XML technology to the management information exchange between
management applications, and management information processing performed by
the key components of the architecture. XML is a new standard data-exchange
format over the Web. As the XML related technologies are added, it can support
not only for data exchange but also for data processing such as parsing, translation
and logging. The main advantages of using it are easy to use, simple but powerful,
large support by application software, openness and inexpensiveness. But these
advantages cannot be maintained in network management application without
appropriate methods for applying XML to network management. By taking
advantages of XML technology, the Web-based network management architecture
gives a way to develop management applications efficiently and to manage
devices effectively. We validate the effectiveness of the Web-based network
management architecture by developing a Web-based management system for a
commercial ultra-dense Linux server based on the architecture.
- i -
Contents
1. Introduction .............................................................................................1I
1.1 Network Management ...................................................................1I
1.2 Web-based Management................................................................3I
1.3 Web-based Element Management .................................................3I
1.4 Web-based Network Management.................................................4I
1.5 Problem Statement.........................................................................6I
1.5.1 Embedded Web Server........................................................7I
1.5.2 Web-based Element Management ......................................8I
1.5.3 Web-based Network Management....................................10I
1.6 Research Approach......................................................................12I
1.7 Organization of Thesis.................................................................13I
2. Related Work .........................................................................................15I
2.1 Applicability of Web Technologies..............................................15I
2.1.1 HTTP ................................................................................15I
2.1.2 Web Documents................................................................16I
2.1.3 Java Applet .......................................................................18I
2.2 Standard Activities.......................................................................19I
2.2.1 WBEM..............................................................................19I
2.2.2 JMX ..................................................................................20I
2.2.3 Comparisons.....................................................................21I
2.3 XML-based Network Management.............................................23I
2.3.1 XML .................................................................................23I
2.3.2 XML for Management Communication ...........................25I
2.3.3 XML for Management Model...........................................26I
2.3.4 Web-based Integrated Management Architecture.............26I
3. Web-based Element Management Architecture.....................................28I
3.1 Embedded Web Server Architecture............................................28I
3.2 EWS Process Structure................................................................31I
- ii -
3.3 Extended Embedded Web Server Architecture............................33
I
3.4 Management Application Interface Mechanism..........................35I
3.4.1 CGI-Type Interface...........................................................37I
3.4.2 SSI-Type Interface............................................................37I
3.4.3 SSI SNMP-Type Interface................................................38I
3.4.4 Java SNMP-Type Interface...............................................40I
3.4.5 Comparison of Application Interface Mechanisms ..........40I
3.5 Management Application Integration Mechanism ......................43I
3.5.1 CGI Library ......................................................................45I
3.5.2 Web Compiler...................................................................46I
3.5.3 MIB2HTML Compiler .....................................................47I
3.5.4 Java SNMP Manager Library...........................................48I
4. Web-based Network Management Architecture....................................49I
4.1 Web-based Network Management Models..................................49I
4.1.1 Management Information Model......................................49I
4.1.2 Management Communication Model...............................51I
4.1.3 Management Organization Model....................................54I
4.2 Web-based Network Management Platform................................57I
4.2.1 WBM Agent......................................................................57I
4.2.2 WBM Manager.................................................................58I
4.2.3 SNMP Integration.............................................................60I
4.3 Comparison with previous work..................................................61I
5. Validation...............................................................................................63I
5.1 POS-EWS....................................................................................63I
5.2 Performance Evaluation of POS-EWS........................................66I
5.2.1 Performance Metrics.........................................................66I
5.2.2 POS-EWS Optimization...................................................68I
5.2.3 Comparison with other embedded Web servers ...............69I
5.3 Validation of Web-based Element Management Architecture.....73I
5.4 Validation of Web-based Network Management Architecture ....75I
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