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Traffic Engineering and Routing in IP Networks with Centralized Control
KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre. KTH, School of Electrical Engineering (EES), Communication Networks.
KTH, School of Information and Communication Technology (ICT).ORCID iD: 0000-0002-3172-076X
KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre. KTH, School of Electrical Engineering (EES), Communication Networks.ORCID iD: 0000-0002-3704-1338
2008 (English)In: Lecture Notes in Computer Science, ISSN 0302-9743, E-ISSN 1611-3349, Vol. 4982, 633-641 p.Article in journal (Refereed) Published
Abstract [en]

There have been research initiatives in centralized control recently, which advocatethat the control of an autonomous system (AS) should be performed in acentralized fashion. In this paper, we propose an approach to perform traffic engineeringand routing in networks with centralized control, named LP-redirect.LP-redirect is based on an efficient formulation of linear programming (LP) thatreduces the number of variables and constraints. As LP is not fast enough for runtimerouting, LP-redirect uses a fast scheme to recompute routing paths when anetwork topology changes. The performance evaluation of LP-redirect shows thatit is more efficient in both traffic engineering and computation than an approachusing optimized link weights. In addition, LP-redirect is suitable for runtime trafficengineering and routing.

Place, publisher, year, edition, pages
2008. Vol. 4982, 633-641 p.
Keyword [en]
traffic engineering; routing; centralized control
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-9414DOI: 10.1007/978-3-540-79549-0_55ISI: 000255924000055Scopus ID: 2-s2.0-44649200684OAI: oai:DiVA.org:kth-9414DiVA: diva2:113878
Note
QC 20100726. Uppdaterad från konferensbidrag till artikel (20100726).Available from: 2008-10-30 Created: 2008-10-30 Last updated: 2017-12-14Bibliographically approved
In thesis
1. On the Design of Next-Generation Routers and IP Networks
Open this publication in new window or tab >>On the Design of Next-Generation Routers and IP Networks
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis investigates distributed router architectures and IP networks with centralized control. While the current trend in IP-router architectures is towards decentralized design, there have also been research proposals for centralizing the control functions in IP networks. With continuous evolution of routers and IP networks, we believe that eventually IP networks in an autonomous system (AS) and a distributed router might converge into one network system. This system, which can be considered both as a distributed router and a centrally-controlled IP network, is divided into a control plane and a forwarding plane. The control plane is responsible for routing, management and signalling protocols, while the forwarding plane is responsible for forwarding packets.

The work in this thesis covers both the forwarding and control planes. In the forwarding plane, we study network processor systems that function as forwarding elements in a distributed router. We introduce a system model and a simulation tool based on the model. Using the simulation tool, we investigate network processor system design by studying throughput, utilization, queueing behavior and packet delays. In addition to network processor systems, we study IP-address lookup, which is one of the key packet processing functions in Internet routers. Our work in IP-address lookup contains an efficient lookup algorithm, a scheme to divide the lookup procedure into two-stages in a distributed router, and an approach to perform efficient lookup on a router supporting multiple virtual routers.

In the control plane, we study three emerging research issues with centralized control. We provide a thorough study of the routing convergence process in networks with centralized control, and compare it with decentralized link-state routing protocols. We propose an efficient approach to perform traffic engineering and routing in networks with centralized control, and compare it with an approach using optimized link weights. Finally, we present an approach to perform loop-free updates of forwarding tables when the forwarding paths change. This loop-free update approach is particularly useful in networks with centralized control.

The results presented in this thesis are useful for building next-generation routers and IP networks with centralized control that might eventually converge into one network system.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. vii, 34 p.
Series
Trita-EE, ISSN 1653-5146 ; 2008:040
Keyword
router architecture, IP-network architecture
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-9381 (URN)
Public defence
2008-11-26, M1, KTH, Stockholm, 14:00 (English)
Opponent
Supervisors
Note
QC 20100726Available from: 2008-11-03 Created: 2008-10-28 Last updated: 2010-07-26Bibliographically approved

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Sjödin, PeterKarlsson, Gunnar

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