You can apply the port-filter policy feature to the control-plane host subinterface to block traffic destined to closed or nonlistened TCP/UDP ports.
Closed-ports—Matches automatically on all closed-ports on the router.
show control-plane host open-ports
http://www.cisco.com/en/US/docs/ios/12_4t/12_4t4/htcpp.html#wp1109374
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