Cisco switch port to ip address mapping

I've made some tests. I think that as interface is intended the interface of the DHCP server that give the DHCP offer. In my setup I use vlans for different DHCP pools. So, in my case, I have to configure:

interface vlan n

ip dhcp server use subscriber-id client-id

It works but in my configuration I had to create dedicated vlans only for DHCP port based!

I think you will have to go to each switch and issue the command

show mac-address-table

and make a note of the information provided. Then go to each linux machine and do something like

echo $(hostname); ifconfig eth0 | grep HWaddr | awk '{print " "$1,$5}'

Now you have 2 lists to match up.