This table lists the administrative distance default values of the protocols that Cisco supports:

Route SourceDefault Distance Values
Connected interface0
Static route1
Enhanced Interior Gateway Routing Protocol (EIGRP) summary route5
External Border Gateway Protocol (BGP)20
Internal EIGRP90
Intermediate System-to-Intermediate System (IS-IS)115
Routing Information Protocol (RIP)120
Exterior Gateway Protocol (EGP)140
On Demand Routing (ODR)160
External EIGRP170
Internal BGP200

In making a forwarding decision actually consists of three sets of processes: the routing protocols, the routing table, and the actual process which makes a forwarding decision and switches packets. These three sets of processes are illustrated, along with their relationship, below.


The longest prefix match always wins among the routes actually installed in the routing table, while the routing protocol with the lowest administrative distance always wins when installing routes into the routing table.