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The aggressive advent in VLSI manufacturing technology has made dramatic impacts on the dependability of devices and interconnects. In the modern manycore system, mesh based Networks-on-Chip (NoC) is widely adopted as on chip communication infrastructure. It is critical to provide an effective fault tolerance scheme on mesh based NoC. A faulty router or broken link isolates a well functional processing element (PE). Also, a set of faulty routers form faulty regions which may break down the whole design. To address these issues, we propose an innovative router-level fault tolerance scheme with spare routers which is different from the traditional microarchitecture-level approach. The spare routers not only provide redundancies but also diversify connection paths between adjacent routers. To exploit these valuable resources on fault tolerant capabilities, two configuration algorithms are demonstrated. One is …