Configuration restrictions and guidelines
PQ applies to all physical interfaces except interfaces using the X.25 or LAPB protocol at the data link layer.
You must enable the rate limit function for the queuing function to take effect on these interfaces: tunnel interfaces, subinterfaces, HDLC link bundle interfaces, and VT/dialer interfaces configured with PPPoE, PPPoA, PPPoEoA, PPPoFR, or MPoFR (frame relay traffic shaping is not enabled on the frame relay interface).