A scheduling discipline and admission control policy for Xunet 2

Saran, Huzur; Keshav, Srinivasan; Kalmanek, Charles; Morgan, Stephen P.

doi:10.1007/3-540-58404-8_9

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…One approach to controlling delay jitter involves retiming or reshaping of traffic within the network, as in Stopand-Go Queueing [GOLE91] or Hierarchical Round Robin Scheduling (HRR) [KALM90,SARA94B]. These disciplines allow the network to control the burstiness of the traffic streams exiting a server, which affects the amount of delay jitter that can be introduced by the downstream switch.…”

Section: Constant Bit Ratementioning

confidence: 99%

“…We found in in-house measurements that two videoconferencing streams produced by the same H.261 codec differed in average rate by a factor of two, depending on whether the speaker was sedate or agitated. In [SARA94B], we supposed that VBR video traffic would be carried through an HRR server, but again we had no way a priori of determining the HRR rate. Of course, one might imagine the user picking from a menu of "default" leaky bucket parameters provided by the encoder, since codecs can be designed [REIB92b] to comply with any given leaky-bucket parameters (CBR output is a special case).…”

Section: Variable Bit Rate Videomentioning

confidence: 99%

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Xunet 2: lessons from an early wide-area ATM testbed

Kalmanek

Keshav

Marshall

et al. 1997

IEEE/ACM Trans. Networking

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-This paper is a retrospective on the design of Xunet 2, one of the earliest functional wide-area ATM networks. Work on Xunet 2 began in 1989 and the network, consisting of experimental ATM switches, IP routers, and 45 Mbps transmission lines, has been operational since October 1991. The network serves as a ''laboratory without walls'' for eight research groups across the United States. While Xunet 2 has only a small number of nodes, it was designed as a prototype of a nationwide ATM network. This paper reviews some of the design decisions and lessons learned in the project and points out the research directions motivated by this work, focusing on the areas of traffic management, ATM switch design, network control, and the implementation of an IP router.

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Section: Constant Bit Ratementioning

confidence: 99%

Section: Variable Bit Rate Videomentioning

confidence: 99%

Xunet 2: lessons from an early wide-area ATM testbed

Kalmanek

Keshav

Marshall

et al. 1997

IEEE/ACM Trans. Networking

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“…Class 1 is used for high priority control messages and is given absolute priority by the link scheduler (multiplexer). Class 2 is used for Video service, Class 3 for Voice, Class 4 for priority data and Class 5 for bulk data [SAR93].…”

Section: The Xunet Signaling and Admission Control Architecturementioning

confidence: 99%

An architecture for managing virtual circuit and virtual path services in ATM networks

Anerousis

Lazar

1996

J Netw Syst Manage

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ATM networks rely on the Virtual Circuit (VC) and Virtual Path (VP) concept to provide unicast connection-oriented services with Quality of Service guarantees. This paper presents a model for managing the configuration and performance of the VC and VP services in these networks. The model consists of a connection management architecture that provides the services and is instrumented for network management purposes, and a network management architecture that uses the OSI management model to provide access to the appropriate service monitoring and control functions. The network management architecture proposes complete managed object definitions that achieve a variety of monitoring and control objectives: service configuration, service performance at the call and cell level, and service control. The latter includes the capability to establish VPs and control their allocated networking capacity and also control parameters of the signaling system that affect the performance of the VC service. The architecture was implemented in its entirety on the Xunet ATM testbed, and several experiments were conducted to illustrate the trade-off between the throughput of the VC service and the allocation of capacity to VPs. The experiments further demonstrated that the signaling system can create throughput bottlenecks in the absence of VPs in the network, and therefore, the network operator can increase performance by controlling the VP distribution.Keywords: ATM, Service Management, Virtual Circuit, Virtual Path, Xunet. IntroductionThe significant progress achieved in the past few years in the development of signaling standards for ATM networks has generated a strong interest for architectures that enable the introduction and management of broadband services. This paper presents a model for managing the Virtual Circuit (VC) and Virtual Path (VP) connection services in ATM networks with Quality of Service Guarantees. These services can be regarded as the core broadband services, in the sense that other more complex services such as video-on-demand, video conferencing, virtual networks, etc., can be built on top of them. We give special attention to the VP service for the following reasons: VPs can be provided as an end-to-end connection service to the users or can be employed by the network operator to opti- mize the call level performance of the ATM network. In this case, they can be used to establish connections for the VC service at a reduced signaling processing cost. This implies that the VP configuration (especially with respect to resource allocation) has a direct impact on the VC service performance. Therefore, the observed performance of the VC service should influence the decisions regarding the distribution of networking capacity to VPs (the VP distribution), and consequently, the VC and VP management architectures should be integrated.In addition to the architecture for managing the VC and VP services, there is a need to develop an understanding of the architecture that provides these services, i.e., the conn...

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“…There are many dierent reservation protocol designs (see, for example, [12,13,14,18,24,28,29]), and they dier in many important aspects. At a more abstract level, however, one can say that there are only two basic approaches to reservation establishment in the literature.…”

Section: Current Approachesmentioning

confidence: 99%

Two issues in reservation establishment

Shenker

Breslau

1995

Proceedings of the Conference on Applications, Technologies, Architectures, and Protocols for Computer Communication

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This paper addresses two issues related to resource reservation establishment in packet switched networks oering realtime services. The rst issue arises out of the natural tension between the local nature of reservations (i.e., they control the service provided on a particular link) and the end-to-end nature of application service requirements. How do reservation establishment protocols enable applications to receive their desired end-to-end service? We review the current onepass and two-pass approaches, and then propose a new hybrid approach called one-pass-with-advertising. The second issue in reservation establishment w e consider arises from the inevitable heterogeneity in network router capabilities. Some routers and subnets in the Internet will support realtime services and others, such as ethernets, will not. How can a reservation establishment mechanism enable applications to achieve the end-to-end service they desire in the face of this heterogeneity? We propose an approach i n v olving replacement services and advertising to build end-to-end service out of heterogeneous per-link service oerings.

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A scheduling discipline and admission control policy for Xunet 2

Cited by 8 publications

References 9 publications

Xunet 2: lessons from an early wide-area ATM testbed

Xunet 2: lessons from an early wide-area ATM testbed

An architecture for managing virtual circuit and virtual path services in ATM networks

Two issues in reservation establishment

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