This is going to be a little detailed, please bear with me.
We are having a problem with workstation connectivity, primarily stations we are rebuilding. The rebuild process involves a PXE boot, which then pulls down a Windows Vista mini system (Microsoft SCCM - Lite Touch) - then the rebuild of the system would occur from there. It had been working for quite some time and then stopped in mid-December.
System boots and PXE completes, tftp download runs and vista mini-system loaded. It seemingly has no network connectivity at that point (no ping in or out), but can do an ipconfig /release and ipconfig /renew successfully.
Subsequent reboots and PXE and tftp fail.
We went 'round and 'round with the application side, testing tftp, dhcp, etc. and they all seem to be working fine.
Today I took a look at the switching side and found something very unusual.
In the above scenario when the system boots for the first time and PXE completes successfully, everything looks good. Once the vista mini-system kicks in, the switch suddenly reports flaps between the port the system is plugged into and the trunk line feeding the switch. All communications stop at that point.
1. sh mac addr addr xxxx.xxxx.xxxx shows the mac on the trunk port (as dynamic)
2. clear mac addr dyn addr xxxx.xxxx.xxxx will NOT clear the mac
3. The mac does not seem to time out (it has been in the table for two days now)
4. The next-hop switch does not show the mac at all with sh mac addr addr xxxx.xxxx.xxxx (I thought maybe a spoofed ip)
Essentially, this has made this workstation unusable (and a number of others) and I am at a loss to explain what is going on. The symptoms have affected a few standalone Vista systems as well as a few 2008 and a single linux server - ipv6 issues? (we aren't running ipv6, but that seems to be the common denominator amongst the systems with problems).
Any suggestions, pointers, or voodoo priestesses gratefully accepted.