Influencing route choices by changing the administrative distance default (optional)
The administrative distance value can be left in its default configuration setting unless a change is needed to improve OSPF performance for a specific network configuration.
The switch can learn about networks from various protocols, including RIP and OSPF. Consequently, the routes to a network may differ depending on the protocol from which the routes were learned. For the switches, the administrative distance for OSPF routes is set at 110 for all route types (external, inter-area, and intra-area.)
The switch selects one route over another based on the source of the route information. To do so, the switch can use the administrative distances assigned to the sources to influence route choices. You can change the distance settings in the OSPF global context to enable preference of one route type over another.