Hi Sarah, I would suggest putting the device in Vwire mode 1st. This will just be bump-in-the-wire deployment, where no L3 needs to be changed. In this scenario, you can utilize threat prevention, url filtering, user id capability, captive portal. This should not include any downtime. Once this is done and you have all visibility to your network and traffic, you can start building configuration on the device to mimic that of ASA or tmg. You can configure IPSec, routing, L3 (You are just configuring the device at this point, where as traffic is flowing normal). Once you verify, everything is configured the way you wanted, you can migrate from other device to PA (this will involve certain downtime but will be minimal). Hope this helps. Thank you.
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