Cisco 2921 ISR Router not picking up IP Address from ISP

[Ian Sully]

I really need help, I have a Cisco 2921 Router that I am trying to use as an internet router. I have my modem connected to a Cisco Catalyst 3750 switch, the WAN is on a special VLAN, I have a home router (which I am trying to replace) connected to the WAN VLAN as well, and I have the 2921 router connected to that VLAN as well on port Gigabit Ethernet 0/0. My ISP is Cable One (now Sparklight). I have posted this .txt file for reference to what the router is doing. If someone can help me, please let me know. Thank you.

Ian 

[Joseph W. Doherty]

Don't know if this the case with your cable provider, but some "latch" on to the MAC.  If that's the case, you'll might be able to reset that by doing a power cycle on your cable model or if that doesn't work, have the router use the same MAC as the prior device.

[Georg Pauwen]

Hello,

I am not clear on your topology. Does it look like this ?

ISP Modem --> Catalyst --> Home Router

                                      --> Cisco router

What if you take the switch out and connect the Cisco router directly to the modem ? What us the purpose of the switch ? Either way, post the full running configs of both the router and the switch.

[paul driver]

Hello

So you have wan rtr and 2921 rtr connected to the same vlan on the switch - what exactly are you trying to achieve?