My Name is Abdul [Edited: "Personal Information"]. My address is: [Edited: "Personal Information"]. My account number is: [Edited: "Personal Information"]. My email address is: [Edited: "Personal Information"]. Phone Number is: [Edited: "Personal Information"]. My Comcast provided SMC modem/router

We have static IPs and our Comcast provided SMC modem/router in "passthrough" mode so we can use our own router and we're considering using Connection Pro to provide backup.  I know the static IP assignments won't follow the switchover to the Cradlepoint but how exactly does the switchover occur in