3.6

Describe Administrative Distance

Administrative distance is something that Cisco created to keep a track of routes when multiple routing protocols are in use on a router. It is the believability/reliability of the routes in a routing table. When the same route is received on a router from differing routing protocols, there needs to be a decider on which protocol is to be preferred. It is a list that goes from the most preferred/accurate to the least.

You are able to manipulate the AD of processes on the router. If you do manipulate these values then you need to do this for all of the routers in the network or you really need to know exactly what you are doing.

ROUTE SOURCEADMINISTRATIVE DISTANCE
Directly Connected0
Static Route1
EIGRP Summary Route5
External BGP20
Internal EIGRP90
IGRP100
OSPF110
IS-IS115
RIP120
EGP140
ODR160
External EIGRP170
Internal BGP200
Unknown255

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