Reports the number of valid routes on this router that have no alternate next-hop associated with any of their primary next-hops. Admins watch this count to gauge network resilience - these are the routes that would black-hole traffic (until normal reconvergence) if their primary next-hop failed, since IP FRR has no precomputed backup for them. A sudden increase in ipFrrUnprotectedRoutes after a topology change would prompt an admin to check whether a link failure removed the loop-free alternates that used to protect those routes.