  When the contacts of an open system flip between different reservoirs, the
resulting nonequilibrium shows increased dynamical activity. We investigate
such active gating for one-dimensional symmetric (SEP) and asymmetric (ASEP)
exclusion models where the left/right boundary rates for entrance and exit of
particles are exchanged at random times. Such rocking makes SEP spatially
symmetric and on average there is no boundary driving; yet the entropy
production increases in the rocking rate. For ASEP a non-monotone density
profile can be obtained with particles clustering at the edges. In the totally
asymmetric case, there is a bulk transition to a maximal current phase as the
rocking exceeds a finite threshold, depending on the boundary rates. We study
the resulting density profiles and current as functions of the rocking rate.
