  We analyze the vortex dynamics in superconducting thin films with a periodic
array of pinning centers. In particular, we study the effect of anisotropy for
a Kagom\'e pinning network when longitudinal and transverse transport currents
are applied. By solving the equations of motion for the vortex array
numerically at zero temperature we find different phases for the vortex
dynamics depending on the pinning and driving force. An unusual sequence of
peaks along and perpendicular to the main hexagonal lattice axes is observed
for the differential resistance reflecting the anisotropy of the transport
properties and the complex behavior of the vortex system. This behavior may be
understood in terms of interstitial pinning vacancies, which create channels of
vortices with different pinning strength.
