1. A method, comprising: selecting, by a node N within a computer network utilizing a directed acyclic graph (DAG) to route packets, a parent node P within the DAG; in response to the parent node P not being a root of the DAG, determining, by the node N, a grandparent node GP as a parent node to the parent node P; selecting, by the node N, an alternate parent node P′ that has connectivity to the grandparent node GP and the node N; and informing, from the node N, the parent node P and the alternate parent node P′ about prefixes reachable via the node N and also about the alternate parent node P′ as an alternate parent node to the parent node P to reach the prefixes reachable via the node N.