BGP-XM: BGP eXtended Multipath for transit Autonomous Systems |
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Authors: | Jose M Camacho Alberto García-Martínez Marcelo Bagnulo Francisco Valera |
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Affiliation: | 1. School of Electrical Engineering, University of Ulsan, Ulsan 680-749, Republic of Korea;2. Samsung Electronics Co. LTD., Suwon, Gyeonggi 443-742, Republic of Korea;1. School of Computer Science and Technology, Zhejiang University of Technology, Hangzhou 310023, China;2. State Key Laboratory of Integrated Services Networks, Xidian University, China;3. School of Systems Information Science, Future University Hakodate, Hakodate 041-8655, Japan;4. School of Information Engineering, Chang’an University, Xi’an 710064, China;1. Deutsche Telekom Laboratories, Technische Universität Berlin, Ernst-Reuter-Platz 7, 10587 Berlin, Germany;2. Telecom ParisTech 23, Avenue d’Italie 75013 Paris, France |
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Abstract: | Multipath interdomain routing has been proposed to enable flexible traffic engineering for transit Autonomos Systems (ASes). Yet, there is a lack of solutions providing maximal path diversity and backwards compatibility at the same time. The BGP-XM (Border Gateway Protocol-eXtended Multipath) extension presented in this paper is a complete and flexible approach to solve many of the limitations of previous BGP multipath solutions. ASes can benefit from multipath capabilities starting with a single upgraded router, and without any coordination with other ASes. BGP-XM defines an algorithm to merge into regular BGP updates information from paths which may even traverse different ASes. This algorithm can be combined with different multipath selection algorithms, such as the K-BESTRO (K-Best Route Optimizer) tunable selection algorithm proposed in this paper. A stability analysis and stable policy guidelines are provided. The performance evaluation of BGP-XM, running over an Internet-like topology, shows that high path diversity can be achieved even for limited deployments of the multipath mechanism. Further results for large-scale deployments reveal that the extension is suitable for large deployment since it shows a low impact in the AS path length and in the routing table size. |
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