IP tracking and DHCP snooping

[gerdo1961]

Hello all,

               I have set up dot1x on our network and enabled IP tracking. I checked the IP tracking database and it is empty, but as soon as I enable DHCP snooping, the IP tracking database becomes populated. Can anyone explain to me why this happens? Do I need DHCP snooping enabled in order for IP tracking to work?

Thanks.

[pieterh]

IP device tracking can function independently from DHCP snooping by using ARP probes

but information can be added from the DHCP snooping database to add MAC - IP mappings

look at this document IP Device Tracking (IPDT) Overview

behavior can vary depending on OS version "on more recent Cisco IOS® releases, its interdependencies are enabled by default "

as result on latest versions 16.x IPDT can automatically be activated by activating dot1x !!!