I have all DHCP clients and server on same VLAN in the same subnet on CAT4507.
I can also ping DHCP server, but the clients are not getting IPs. I've checked DHCP config on server seems to be OK. When I turn on debug I get following:
1w3d: DHCP process ID FFFFFFFF status 0
1w3d: DHCP Network Discovery is disabled
1w3d: DHCP NetDiscovery Informs 0 Discovers 0 Period 0
The server and the client are in the same vlan, no helper required, the server will see the request for the client. - same boradcast domain. This same questions was posted in Lan swithcing forum and just needed to enable the spanning-tree portfast.