I have had occassional issues with dhcp not functioning in my catalyst 6503. All resolved after finding the solutions in this great forum. This time, my IP phones are not picking up dhcp addresses from the main switch. The 'status' shows : 'dhcp timeout'.
The interfaces are configd with switchport voice vlan. To test dhcp, I configured the same port for access vlan and connect a laptop on it, the laptop immediately
picks up a dhcp address. This proves that dhcp works. But if I put the port back on voice vlan and connect an IP phone, nothing happens (dhcp timeout).
This issue is happening on several switches on one vlan. DHCP has worked fine on the vlan for at least 2 years. Suddenly it stopped working today after rebooting one switch. I have tried adding ip helper-address on the int vlan, cleared all unused ip dhcp bindings, cleared ip dhcp conflicts logging, and there are plenty of available dhcp addresses.
Any ideas would be greatly appreciated.
Thanks!
Julio
