2 Comments on “What is the default administrative distance of the OSPF routing protocol?”

1. big bad guy says:

   December 1, 2015 at 10:18 pm

   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

   
   
   
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2. John says:

   February 27, 2016 at 12:58 am

   Open Shortest Path First (OSPF) is a routing protocol for Internet Protocol (IP) networks. It uses a link state routing algorithm and falls into the group of interior routing protocols, operating within a single autonomous system (AS).

   On Cisco routers, routes issued by OSPF have a higher (default) administrative distance than routes issued by the Routing Information Protocol. By default, OSPF has a default administrative distance of 90 and RIP has a default administrative of 120

   Administrative distance (AD) is an arbitrary numerical value assigned to dynamic routes, static routes and directly-connected routes. The value is used by vendor-specific routers to rank routes from most preferred to least preferred.[1][2] When multiple paths to the same destination are available, the router uses the route with the lowest administrative distance and inserts the preferred route into its routing table.

   List of Routing Protocol Administrative Distance Value

   External Border Gateway Protocol (eBGP) 20
   Internal EIGRP 90
   IGRP 100
   OSPF 110
   10 more rows
   List of Routing Protocol Administrative Distance Value – …

   
   
   
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