I too faced the same issue that as per the cisco basline configuration no dhcp service can be configured if nor DHCP service is running. But disabling the dhcp service disabled the IP HELPER-ADDRESS fuction as well. I hope when ip helper address is configured and the router identify the broadcast using the port number 63 and send the unicast to server.
So no dhcp service definitely disables ip helper-address fucction. It happend to me and when I enable dhcp servercie issue went away.
Just to add to the above posts, once i had configured "no service dhcp", just for test purpose (on 6500). Later vlans and SVIs were configured along with helper addresses. However clients were not getting IPs, just then i re enabled "service dhcp" and clients started getting IP addresses.
Just resolved incident, where doing " no service dhcp" disrupted only ip phones dhcp services and not PCs. Both PCs and IP phones point to same dhcp server..i.e same "ip helper-address" on voice and data vlan.
IP phones (voice vlan) dhcp packet is on different subnet to DHCP and break, PC(data vlan) dhcp service don't
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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