"device tracking limit 2" + ip alias == only one IPDT binding

When I turn on ip device tracking, then set the tracking limit to 2 on a port, then connect a host that is using an ip alias address (same mac, different IP a-la "ip address secondary") then there is only one IP address entry under "show ip device tracking interface XX".  It alternates between the two addresses.  Note one address is not reachable from the switch SVI, so probes might not work, but the switch seems to pick the address up readily from passive ARP.
Is this normal behavior?  Am I missing a hidden setting?

This topic is probably better suited in another Infrastructure forum, but I suppose it depends on which features are supported by your Cisco hardware and software. This doc discusses a variety of options:
http://www.cisco.com/en/US/docs/ios/12_2/qos/configuration/guide/qcfpolsh.html
For example, with the older CAR (committed access rate) approach:
interface FastEthernet5/0
     rate-limit input access-group 101 20000000 [normal burst size] [excess burst size] conform-action transmit exceed-action drop
     rate-limit input access-group 102 5120000 [normal burst size] [excess burst size] conform-action transmit exceed-action drop
access-list 101 permit ip 10.10.10.3 0.0.0.0
access-list 102 permit ip 10.10.10.4 0.0.0.0
You can observe CAR in action with "show interfaces fa5/0 rate-limit" for example.

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