A network on chip (NoC), a communication control method, and a controller are provided. The NoC includes multiple routers and multiple network interfaces NIs, each router in the multiple routers is connected to one local node device using one NI, and each router includes one output port connected to an NI, one input port connected to the NI, multiple output ports connected to other routers, and multiple input ports connected to other routers; there is an input bypass channel between the output port that is connected to an NI and of each router and each input port that is connected to another router and of the router. There is an output bypass channel between the input port that is connected to an NI and of each router and each output port that is connected to another router and of the router.