List of Administrative Distances (AD) of IP routing Protocols

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When there are two or more different routes to the same destination from two different routing protocols, Administrative Distance counts the reliability of a routing protocol. The AD value can range from 0 to 255. A lower AD value is more trusted by an L3 device. Therefore, the best AD value is 0 (lower number is always better) and the worst is 255.

 

Route source/Protocol

 

Default Distance Values

Connected interface

0

Static route

1

EIGRP summary route

5

eBGP

20

Internal EIGRP

90

IGRP

100

OSPF

110

IS-IS

115

RIP

120

EGP

140

ODR

160

External EIGRP

170

iBGP

200

Unknown

255