Default administrative distances are applies to Cisco routers.
The smaller the AD(Administrative Distance) value, the higher the priority in routing. However, if the subnet mask length is more specific, it is preferentially reflected even if the priority is low.
| Routing protocol | Default administrative distance |
| Directly connected Interface | 0 |
| Static | 1 |
| DMNR(Dynamic Mobile Network Routing) | 3 |
| EIGRP summary route (Enhanced Interior Gateway Routing Protocol) | 5 |
| EBGP | 20 |
| EIGRP(Internal) | 90 |
| IGRP(Interior Gateway Routing Protoco) | 100 |
| OSPF(Open Shortest Path First) | 110 |
| IS-IS(Intermediate System to Intermediate System) | 115 |
| RIP(Routing Information Protocol) | 120 |
| EGP(Exterior Gateway Protocol) | 140 |
| ODR(On Demand Routing) | 160 |
| EIGRP(External) | 170 |
| IBGP(Internal BGP) | 200 |
| NHRP(Next Hop Resolution Protocol) | 250 |
| Unknown routing protocol | 255 |