Cisco UC540W DHCP Internet connection Issue.

[solucionesexpertas]

Hi guys, i would like some help trying to figure this out:

We have an UC540 system in our office, we also have a broadband internet connection through a local ISP, the UC540 internet connection setup is DHCP, but when i connect the ONT cable into the WAN port, it doesnt get any ip address, i tried with other device (D-LINK router) and it works perfectly.

I need your advice to let me know what i am missing. Here is the sh run configutarion, and no CLI changes have been made by the way.

Thanks in advance for the assistance.                  

[paolo bevilacqua · Accepted solution]

ISP may have a temporary MAC lock to other router address. So you may need to stay with ISP device turned off some hours or a night before reconnecting Cisco.