I have a 3750 switch stack running version 12.2(53)SE2 IPBASEK9-M. I have dot1x configured on the switch and have a Windows 7 PC connected with 802.1x configured on the interface. I see the EAPoL start message from the PC, but I don't see any RADIUS packets from the switch to the RADIUS server. I have a simple dot1x config just to try to get it working prior to adding additional features such as guest-vlan...
Config and debug file attached.
I don't know if the ip dhcp snooping and arp inspection configuration is causing an issue with this or not. I see the EAPoL packet received on the switch as seen in the debug attachment, but I still never see the RADIUS packet. I did set both to trust on the interface but still the same outcome. I can't disable it since it is a production switch with a test interface.
I got the same problem and simply solved by configure the switch as authenticator instead of supplicant. "Supplicant" means client, "authenticator" actually means the switch is acting as a pass-through authenticator, it will forward requests to the auth server, for e.g., radius host.