by Pavlou, George; Anerousis, Nikos; Zimmer, Wolfgang

DOI: 10.1023/A:1011357628868
Print publication date: 9/1/2001
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DOI: 10.1023/A:1017332129853
Print publication date: 9/1/2001
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by Pavlou, George; Hasan, Masum

DOI: 10.1023/A:1011306812030
Print publication date: 9/1/2001
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by Kim, Jae-Young; Hong, James Won-Ki; Choi, Tae-Sang

Differentiated Services (DiffServ), which are currently being standardized in the IETF DiffServ working group, is a solution that can provide different qualities of service to different network users. DiffServ aggregates network packets at edge routers and forwards the aggregated packets to core routers with different priorities. In this paper, we propose methods using the SNMP framework for monitoring edge-to-edge traffic aggregates in a DiffServ domain, which consists of a set of DiffServ-enabled routers. In order to manage each DiffServ router, we have analyzed the DiffServ MIB and instrumented it in the router. Further, we propose monitoring behaviors of edge-to-edge traffic aggregates by combining topology and performance information from MIB II and DiffServ MIB. Construction procedures and graphical representation of the edge-to-edge traffic aggregates are explained in detail. We also extend our efforts to implement a DiffServ domain monitoring system that monitors a set of DiffServ-enabled routers and traffic aggregates between every edge router pair. We believe that the proposed monitoring methods can serve as useful building blocks for managing DiffServ networks.

DOI: 10.1023/A:1011385613015
Print publication date: 9/1/2001
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by Stiller, Burkhard; Reichl, Peter; Gerke, Jan; Flury, Placi

Pricing and charging are important management functions which future commercial networks will have to offer. Since the Internet is on the move to provide differentiated services, suitable and scalable management mechanisms are required for the backbone based on the Differentiated Services (DiffServ) Architecture. Since network management following actual market forces has to implement a price-driven and charge-driven approach for managing the usage of services, this paper introduces as a first contribution the design of a generic and modular Internet Charging System (ICS), offering a service-independent architecture and integrating economically controlled network management functions into present Internet technology. Moreover, a central part of this ICS, i.e., the Internet Charge Calculation and Accounting System (ICCAS), is presented in more detail and offers necessary user support functions. The second main contribution of the paper focuses on the newly developed Cumulus Pricing Scheme (CPS). CPS is unique to define clear relations between different time-scales for accounting, monitoring, and charging activities. Charges in this schemes are based on flat fees and, hence, are predictable and transparent, whereas, unlike pure flat rate schemes, the incorporated feedback mechanism nevertheless allows to take market forces into account. Finally, it is demonstrated how the ICCAS is well-suited to integrate both DiffServ technology and CPS.

DOI: 10.1023/A:1011333628945
Print publication date: 9/1/2001
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by Thottan, M.; Ji, C.

IP traffic management is important for the continued growth of the Internet. Several traffic management algorithms exist today. However, to enable these algorithms it is necessary to provide reliable alarms relating to network performance bottlenecks and failures. In this work we propose an algorithm to obtain reliable predictive alarms for network fault conditions. The algorithm is based on modeling network fault behavior. The algorithm has been successfully tested on two production networks. Predictive alarms were obtained for four different types of failures: file server failures, network access problems, protocol implementation errors, and runaway processes. The potential of using this model to do fault classification is also discussed. In addition, it is shown that the proposed algorithm performs better than the majority-vote scheme.

DOI: 10.1023/A:1011381512107
Print publication date: 9/1/2001
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by Raz, D.; Shavitt, Y.

The emerging next generation of routers exhibit both high performance and rich functionality, such as support for virtual private networks and quality-of-service (QoS). To achieve this, per flow queueing and fast IP filtering are incorporated into the router hardware. The scalable management of a network comprising such devices and efficient use of the new functionality introduce new challenges. A promising approach is to distribute the network management applications and execute them with minimal central control. This work concentrates on the way multiple distributed control tasks can be deployed in IP networks. By a prototype that uses active network techniques we show how truly distributed applications can be used for control and monitoring. We study basic management applications, show the potential gain from running them distributively, and demonstrate their implementation.

DOI: 10.1023/A:1011329528036
Print publication date: 9/1/2001
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by Bernstein, Lawrence; Yuhas, C. M.

DOI: 10.1023/A:1011330711198
Print publication date: 9/1/2001
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