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Multipath routing protocols provide several alternative paths between source and destination nodes to achieve seamless and reliable communications in MANET (Mobile Ad-hoc NETwork) environments. Since nodes in tactical MANET environments are frequently moving, however, the possibility that alternative paths as well as the primary route are broken is much higher than that in ordinary ad-hoc communication environments. In this paper, the authors propose a Label-Switched Routing protocol with Local Multi-Paths (shortly, LSR-LMP) for seamless and reliable message delivery in ubiquitous tactical MANET environments. Instead of configuring alternative paths between source and destination nodes as in most of existing schemes, the proposed method establishes alternative paths locally between the two-hop distance nodes along the primary path.
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