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To accommodate the asymmetric characteristic of Intet traffic, we propose a flexible node architecture based on multi-flow optical transponders (MF-OTP) under the integrated Cloud-Fog framework. The proposed MF-OTP architecture is flexible in the following two degrees. Firstly, it can be flexibly adjusted to transmit either down-stream or upstream traffic according to the timely traffic demand distribution. Secondly, it allows multiple sub-channels using flexible (i.e., same/different) modulation formats to serve the same traffic demand. To evaluate the efficiency of the flexible MT-OTP in serving asymmetric traffic, we propose two integer lin-ear programming (ILP) models to address the routing, modulation and spectrum assignment (RMSA), with one aiming at minimizing the required number of sub-channels and another aiming at maximizing the volume of traffic transmission. Numerical simulations are con-ducted and the results show that the proposed models based on the flexible MF-OTP archi-tecture requires less number of sub-channels and can serve more traffic demands.