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The Alternative Best Effort Service

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Quality of Service Provided by Deficit Round Robin Algorithm

Nevena Vratonjic, Nevena Krsmanovic

In this paper we examine performance of the switches with output buffers for traffic with reservations and best-effort traffic. Packets are scheduled according to the Deficit Round Robin (DRR) algorithm. The DRR has been modeled, and quality of service in ...

2006

Binary Versus Analogue Path Monitoring in IP Networks

Patrick Thiran, Xuan Hung Nguyen

Monitoring systems that can detect path outages and periods of degraded performance are important for many distributed applications. Trivial pairwise probing systems do not scale well and cannot be employed in large networks. To build scalable path monitor ...

2005

"Pay bursts only once" does not hold for non-FIFO Guaranteed Rate nodes

Jean-Yves Le Boudec, Gianluca Rizzo

We demonstrate that, contrary to what is generally believed, the existing end-to-end delay bounds apply only to GR nodes that are FIFO per flow. We show this by exhibiting a counter-example. Then we show that the proof of the existing bounds has a subtle, ...

2005

Delay aspects in Internet telephony

Catherine Boutremans

In this work, we address the transport of high quality voice over the Internet with a particular concern for delays. Transport of interactive audio over IP networks often suffers from packet loss and variations in the network delay (jitter). Forward Error ...

EPFL2003

Measurement and Analysis of Single-Hop Delay on an IP Backbone Network

Patrick Thiran

We measure and analyze the single-hop packet delay through operational routers in the Sprint Internet protocol (IP) backbone network. After presenting our delay measurements through a single router for OC-3 and OC-12 link speeds, we propose a methodology t ...

2003

Deterministic End-to-End Delay Guarantees in a Heterogeneous Route Interference Environment

Jean-Yves Le Boudec

Some of the known results for delivering deterministic bounds on end-to-end queuing delay in networks with constant packet sizes and constant link rates rely on the concept of Route Interference. Namely, it is required to know the number of flows joining o ...

2003

Packet scale rate guarantee for non-FIFO nodes

Jean-Yves Le Boudec

Packet Scale Rate Guarantee (PSRG) is a generic node model which underlies the definition of Expedited Forwarding (EF) proposed in the context of Internet Differentiated Services. For the case of FIFO nodes, PSRG is equivalent to the well-understood concep ...

2003

The provision of a low delay service within the best-effort Internet

Paul Hurley

In this work, we define a novel Internet service, called ABE (Alternative Best-Effort), which allows interactive multimedia applications to receive low queuing delay within the existing best-effort Internet. We then develop and analyse a number of innovati ...

EPFL2002

Impact of link failures on VoIP performance

Catherine Boutremans

We use active and passive traffic measurements to identify the issues involved in the deployment of a voice service over a tier-1 IP backbone network. Our findings indicate that no specific handling of voice packets (i.e. QoS differentiation) is needed in ...

2002

Impact of link failures on VoIP performance

Catherine Boutremans

2002