If your Router is working as a DHCP Relay and you have more than one ip helper-address command what actually happens:
1. The Router forwards the DHCP Discover to the first DHCP Server and if this one does not respond then the Router works sequentially down the list until a Server makes a DHCP Offer to the Client?
2. The Router forwards the DHCP Discover to all DHCP Servers defined by the multiple ip helper-address commands and the first Server to respond with a DHCP Offer Message?
Thanks in advance :)