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Dual Protection Routing Trees on Graphs
Version 1
: Received: 6 June 2023 / Approved: 6 June 2023 / Online: 6 June 2023 (07:36:01 CEST)
A peer-reviewed article of this Preprint also exists.
Pai, K.-J. Dual Protection Routing Trees on Graphs. Mathematics 2023, 11, 3255. Pai, K.-J. Dual Protection Routing Trees on Graphs. Mathematics 2023, 11, 3255.
Abstract
In IP networks, packet forwarding is destination-based and hop-by-hop, and routes are built as needed. Kwong et al. introduced a protection routing in which packet delivery to the destination node can proceed uninterrupted in the event of any single node or link failure. He then shows that “whether there is a protection routing to the destination” is NP-complete. Tapolcai find that two completely independent spanning trees, abbreviated as CISTs, can be used to configure the protection routing. In this paper, we propose dual protection routing trees, denoted as dual-PRTs to replace CISTs, which are less restrictive than CISTs. Next, we propose a transformation algorithm that uses dual-PRTs to configure the protection routing. Taking complete graphs Kn, complete bipartite graphs Km,n, hypercubes Qn, locally twisted cubes LTQn as examples, we provide a recursive method to construct dual-PRTs on them. This article will show that there are no two CISTs on K3,3, Q3, and LTQ3, but there exist dual-PRTs that can be used to configure the protection routing. As shown in the performance evaluation of simulation results, for both Qn and LTQn, we get the average path length of protection routing configured by dual-PRTs is shorter than that by two CISTs.
Keywords
Protection Routing; Completely Independent Spanning Trees; Dual Protection Routing Trees; Complete graphs; Complete Bipartite Graphs; Hypercubes; Locally Twisted Cubes.
Subject
Computer Science and Mathematics, Data Structures, Algorithms and Complexity
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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