I am seeing VM and physical servers with static ip addresses assigned to them come up with a 169.x address after a reboot.

[keithpiro]

The servers are connected to a 6509 switch.  The VM servers are connected via a 10 gig trunk port and the physical servers are connected via 1gig copper. Is this an IOS issue. I haven't updated the code on my 6509 so I can rule that out.  I have however done IOS updates on the edge 3750's and 2960's. 

[casa_far]

During a recent migration I faced to the same problem and It seems a new mechanism to avoid duplicate ip addresses on Microsoft OS (Win2008/Win7) and the arp probing in the switches with ios 15.x:

Found here:

http://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/8021x/116529-problemsolution-product-00.html

https://supportforums.cisco.com/discussion/11960461/ip-device-tracking

If help please rate !

Good Luck