Influencing route choices by changing the default administrative distance
The administrative distance value can be left in its default configuration setting (110) unless a change is needed to improve OSPFv3 performance for a specific network configuration.
The switch can learn about networks from various protocols. Consequently, the routes to a network may differ depending on the protocol from which the routes were learned. On the routing switches, the administrative distance for OSPFv3 routes is set at 110 for all route types (external, inter-area, and intra-area).
The routing switch selects routes on the basis of route source information. To enable this operation, the administrative distance assigned to each source is used to influence route choices. You can change the distance settings in the OSPFv3 global context to enable preference of one route typeover another.