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You are here: Home / Cisco Routers / Administrative Distance of Routing Protocols

Administrative Distance of Routing Protocols

Written By Harris Andrea

Cisco Routers support many dynamic routing protocols for learning routes in a complex network topology. The routing protocols supported are the following:

  • RIP
  • OSPF
  • BGP
  • IS-IS
  • IGRP
  • EIGRP

Each routing protocol has its own Administrative Distance (AD), which is a value representing the trustworthiness of the specific routing protocol. If a router learns a destination route from two or more routing protocols, it selects the route from the protocol having the smallest Administrative Distance.

The table below shows the default AD values for each routing protocol:

Routing Protocol

AD Value

Connected 0
Static 1
eBGP 20
EIGRP 90
IGRP 100
OSPF 110
IS-IS 115
RIP 120
iBGP 200

Now, if the router learns a specific destination route from both OSPF and RIP, it will select the route learned from OSPF because this protocol has a smaller AD compared to RIP (110 instead of 120).

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Filed Under: Cisco Routers

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About Harris Andrea

Harris Andrea is an Engineer with more than two decades of professional experience in the fields of TCP/IP Networks, Information Security and I.T. Over the years he has acquired several professional certifications such as CCNA, CCNP, CEH, ECSA etc.

He is a self-published author of two books ("Cisco ASA Firewall Fundamentals" and "Cisco VPN Configuration Guide") which are available at Amazon and on this website as well.

Comments

  1. karan says

    August 25, 2011 at 4:39 pm

    Is this AD value change nd vht is the command?

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