This document demonstrators how to deploy WFilter with a cisco rvs4000 router. The network topology diagram:
In such a network, you need to setup a mirroring port in the cisco rvs4000 for monitoring/filtering. The below diagram shows the router's mirroring settings:
As in "Figure 2", the WFilter computer shall be connected "port 2" (Mirror Port); the switch is connected to "port 4" (mirrored source port).