Hi Vince
There are multiple machines with Windows 7 Enterprise on them..What I observed was that another machine with different NIC model was throwing too many errors on switchport so on further investigation it was found port to be faulty.The same machine was captured by splunk with over 10000 DHCP requests over 24 hours and when I observed the port was flapping when it was set to auto negotiating on both ends but would operate on half/10 Mb if manually set.I believe Windows 7 DHCP broadcast behavior where it sends DHCP requests even after valid IP(INIT-REBOOT) on disconnect - connect could be possible issue where on a flapping port even with IP assigned to Windows machine it keeps sending DHCP REQ upon disconnect - connect with broadcast flags 1 or 0 depending upon what DHCP server supports.For now machines reporting too many DHCP requests are under monitoring and we have moved them to different LAN ports to make sure the ports are error free and are not flapping like the one observed.Results are awaited but I have strong feeling this all came out of bad LAN ports on user desks.
Thanks
Karan