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In this paper, the authors address the problem of Shared Backup Path Protection (SBPP) against random failures of single links in connection-oriented communication networks. Most of recent works has been concentrated on protecting the unicast traffic. Their paper is also focused on shared protection of anycast (i.e. one-to-one-out-of-many) flows. Anycasting is frequently met in practice (e.g., in Content Delivery Networks, peer-to-peer systems, or DNS service). A new ILP model for joint optimization of dedicated working and shared backup paths of anycast and unicast demands is introduced and is followed by extensive simulation research.
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