If an Open Shortest Path First version 3 (OSPFv3) network
requires high security, you can configure an authentication
mode to improve network security.
Open Shortest Path First version 3 (OSPFv3) supports packet authentication, enabling routers to receive only the OSPFv3 packets that are authenticated. If packets fail to be authenticated, OSPFv3 neighbor relationships cannot be established. This section describes how to configure an authentication mode.