Gerry,Here is the config we are using. This allows DHCP requests for PCs to traverse the channels successfully. IP phones receive ip from the switch DHCP service. I am not sure it will be a great help for your particular issue.
There appears to be a software bug with the 3750s. I have lodged a case with the TAC. We have been able to replicate the problem by simply connecting 2 Cat 3750s via fastethernet and no trunking. On one 3750 set up a dhcp server. On the second set up...
I have a similar issue where untrusted dhcp-clients cannot make a DHCP request. I get exactly the debug output. The Catalyst 3750 IOS Version is SMI 12.2(20)SE. The trunk ports which lead to the DHCP Servers are set to trusted where as the interfaces...