Administrative Distance (Cisco Systems)

What Is Administrative Distance? (Cisco Systems)
Route Source Default Distance: Values
Connected interface: 0
Static route:1
Enhanced Interior Gateway Routing Protocol (EIGRP) summary route: 5
External Border Gateway Protocol (BGP): 20
Internal EIGRP: 90
IGRP: 100
OSPF: 110
Intermediate System-to-Intermediate System (IS-IS): 115
Routing Information Protocol (RIP): 120
Exterior Gateway Protocol (EGP): 140
On Demand Routing (ODR): 160
External EIGRP: 170
Internal BGP: 200
Unknown*: 255

* If the administrative distance is 255, the router does not believe the source of that route and does not install the route in the routing table.