We demonstrate a 1×2 all-optical comb switch using a 200 µm diameter silicon ring resonator with a switching time of less than 1 ns. The switch overcomes the small bandwidth of the traditional ring resonator, and works for wavelength division multiplexing applications. The device has a footprint of ~0.04 mm2 and enables switching of a large number (~40) of wavelength channels spaced by ~0.85 nm.