Route & Path Selection

[MarioMarquez]

I have a Cisco backround & I am currently studying Virtual Routers & Static Routes in the PA 8.0 admin guide.  I am trying to understand how Metrics are used in the firewall because it sounds like Administrative Distance does the same thing.  Can someone tell me if my theory is right when it comes to Palo Alto forwarding packets to an intended destination.  Here is my assumption below...

I am assuming that if traffic hits a virtual router & there are multiple routes to the same destination address the Palo Alto will first prefer the route with the most specific destination prefix (longest prefix match) and if the prefix's are the same for all routes the Palo Alto will prefer the route with the lowest Administrative Distance & if the Admin Distance is the same for the for all routes the Palo Alto will prefer the route with the lowest Metric.  Is this theory correct?

[LukeBullimore]

you'll need PBF with path monitoring; monitoring an external IP. if that link drops, the PBF rule automatically disables itself. You can change the AD manually per static route, just not for DHCP injected routes - hence the need for PBF policies if your bottleneck is DHCP.

I hope this helps.