Question about "Enable Antipads as Route Keepouts (ARK)"

Hello,

 I have defined an Anti Pad for the differential pairs of a high speed connector within the padstack for those pins.  I have checked the box beside "Enable Antipads as Route Keepouts (ARK)" on the parameters tab of the padstack. 

Is there anything else I need to enable within Allegro (16.5) to get this to work?  When I place the connector on my PCB I am not seeing the Antipad Keepouts.

Is this feature only used for the SPECCTRA autorouter?

Thanks in advance for the help!

Brian