NDLI: On the relative behavior of source and distributed routing in NOWs using Up*/Down* routing schemes

Content Provider	IEEE Xplore Digital Library
Author	Sancho, J.C. Robles, A. Duato, J.
Copyright Year	2001
Description	Author affiliation: Dept. de Inf. de Sistemas y Comput., Univ. Politecnica de Valencia, Spain (Sancho, J.C.)
Abstract	Networks of workstations (NOWs) are arranged as a switch-based network with irregular topology, which makes routing and deadlock avoidance quite complicated. Current proposals use the up/down routing algorithm to remove cyclic dependencies between channels and avoid deadlock. Recently, a simple and effective methodology to compute up/down routing tables has been proposed by us. The resulting up/down routing scheme increases the number of alternative paths between every pair of switches and allows most messages to follow minimal paths. Also, up/down routing is suitable to be implemented using source or distributed routing. Source routing provides a safer and lower cost implementation of up/down routing than that provided by distributed routing. However distributed routing may benefit from routing messages through alternative paths to reach their destination. In this paper we evaluate the performance of up/down routing when using two methodologies to compute routing tables, and when both source and distributed routing are used. Evaluation results show that it is not worth to implement up/down routing in a distributed way in a NOW environment, since its performance is very close to that achieved by implementing it with source routing when a traffic-balancing algorithm is used. Moreover it is shown that a greater improvement in performance can be achieved by modifying the method to compute up/down routing tables when source routing is used.
Sponsorship	Consorzio Univ. Mantovano
Starting Page	11
Ending Page	18
File Size	735741
Page Count	8
File Format	PDF
ISBN	0769509878
DOI	10.1109/EMPDP.2001.904962
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-02-07
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Routing Switches Network topology System recovery Communication switching Workstations Costs Computer networks Proposals LAN interconnection
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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