Configuration restrictions and guidelines
CQ applies to all physical interfaces except interfaces using 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 or dialer interfaces configured with PPPoE, PPPoA, PPPoEoA, PPPoFR, or MPoFR (frame relay traffic shaping is not enabled on the frame relay interface).