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Intra-Domain Routing Convergence with Centralized Control
KTH, School of Electrical Engineering (EES), Communication Networks.
KTH, School of Information and Communication Technology (ICT), Communication: Services and Infrastucture, Telecommunication Systems Laboratory, TSLab.ORCID iD: 0000-0002-3172-076X
KTH, School of Electrical Engineering (EES), Communication Networks.ORCID iD: 0000-0002-3704-1338
2009 (English)In: Computer Networks, ISSN 1389-1286, E-ISSN 1872-7069, Vol. 53, no 18, 2985-2996 p.Article in journal (Refereed) Published
Abstract [en]

The decentralized control scheme for routing in current IP networks has been questioned, and a centralized routing scheme has been proposed as an alternative. In this paper, we compare the convergence of centralized control scheme with decentralized link-state routing protocols. We first review the architectural advantages and challenges of centralized control. Thereafter, we identify and discuss the components of the convergence time in both schemes. We present how to achieve fast routing convergence in networks with centralized control. in particular, we analyze how to distribute forwarding information efficiently. Finally, we perform simulation studies on the convergence time for both real and synthetic network topologies and study the impact of control element location, link weights, and number of failures on the convergence time. The results show that the centralized control scheme can provide faster routing convergence than link-state routing protocols.

Place, publisher, year, edition, pages
2009. Vol. 53, no 18, 2985-2996 p.
Keyword [en]
Routing convergence; Centralized control; Link-state routing protocols
National Category
Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-9437DOI: 10.1016/j.comnet.2009.07.008ISI: 000272862600002Scopus ID: 2-s2.0-70449526570OAI: oai:DiVA.org:kth-9437DiVA: diva2:113969
Note
QC 20100726. Uppdaterad från submitted till published (20100726).Available from: 2008-11-03 Created: 2008-11-03 Last updated: 2013-09-09Bibliographically 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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