Administrative Distance (AD) is a value that routers use in order to select the best path 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. Administrative Distance (AD) is a numeric value which can range from 0 to 255. A smaller Administrative Distance (AD) is more trusted by a router, therefore the best Administrative Distance (AD) being 0 and the worst, 255.
Administrative Distance (AD) |
Route Type |
0 |
Connected interface |
0 or 1 |
Static Route |
90 |
Internal EIGRP Route (within the same AS) |
100 |
IGRP Route |
110 |
OSPF Route |
115 |
IS-IS |
120 |
RIP Route |
255 |
Unknown Route |
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