The status is reflected in the table view in the portal. Once a new policy is added you can see in the table view the routing status changing from Processing to OK, which means the defined routing URL is set and routing traffic based on the defined source regions to each active JPD.
In the event of one of the JPDs being down, traffic routed from the defined source regions will be unresolved and so the routing status will change to ERROR although the other JPDs under the policy might be fine and traffic will continue to be routed to them.