Configuring Administrative Distance

Administrative distance configures the preference given to a route learned from one protocol over the same route learned from another protocol. The route with the lowest administrative distance is installed in the IP routing table and propagated to neighbors.

Routes with distance values of 255 are not installed in the routing table.

Use the distance command in IS-IS configuration command mode to set the distance of IS-IS routes to the specified value.

IS-IS has a default administrative distance of 115.

The following example shows how to change the administrative distance for external IS-IS routes to 100:

System(rw-config)->router isis
System(rw-config-isis)->distance isis external 100