Priority-based OSPF Convergence
Priority-based OSPF convergence ensures that specific routes converge first when a great number of routes need to converge. Different routes can be set with different convergence priorities. This allows important routes to converge first and therefore improves network reliability.
By using priority-based OSPF convergence, you can assign a higher convergence priority to routes for key services so that those routes can converge fast. By so doing, the impact on key services is reduced.