By adjusting the Hello interval set on OSPFv3 neighbors, you can change the speed of establishing the neighbor relationship, therefore changing the speed of network convergence.
Hello packets are periodically sent to the neighbor router to detect and maintain the neighbor relationship and to elect the DR and the BDR. RFC 2328 requires that the Hello timer values of neighbors be consistent. The value of the Hello timer is inversely proportional to the route convergence speed and network load.
interface interface-type interface-number
ospfv3 timer hello interval [ instance instance-id ]