Strange issue with PXE boot.
3750 Series running (C3750-IPSERVICESK9-M), Version 12.2(50)SE3.
VLAN1 = High school data
VLAN208 = Middle school data
VLAN209 = Elem school data
IP helpers for both PXE server and DHCP server in all vlans with PIM enabled.
IP routing is enabled.
Switches in Mid/Elem buildings are Cisco 2960G-24 and 48's with Portfast enabled.
PXE server is on vlan 1 (High School)
If we are connected to vlan 1 in High school or assign a port to vlan 1 in other buildings, PXE boot works with all our models of dell desktops, 170L, GX750, 760's.
If we are connected to VLAN 208 or 209 in other buildings, DHCP info is receive but, fails to find server with all PC's and nothing is registered in the PXE server log. WAIT FOR IT!! for the exception of the Dell Optiplex 760 series. Those work flawlessly in any port, on any 2960G switch, in any VLAN.
So, One points to a problem with the VLAN's but, the Dell 760's seem to point to a PC problem.