Default Administrative Distance of all Routing Protocols

What is Administrative Distance?

Administrative distance is the feature that all Routers use to select the best path when there are two or more different routes to the same destination from two or more different Routing protocols like RIP, EIGRP or OSPF etc. Administrative distance is a measure of the trustworthiness of the source of the Routing information. Administrative distance is the first criterion that a Router uses to determine which routing protocol to use if two protocols provide route information for the same destination. Administrative distance has only local significance and is not advertised in any routing updates.

Administrative Distance list of All Routing Protocols:

Cisco Routers supports many static and dynamic Routing protocols for learning routes in a complex network topology. The Cisco Routers supported the following Routing protocols.

Static

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 routes from two or more Routing protocols, it selects the route from the protocol which is having the lowest Administrative Distance. For Example, if the Router learns a specific destination route from both OSPF (AD 110) and RIP (AD 120), it will select the route learned from OSPF because this protocol has a smaller AD compared to RIP.

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

Routing Protocol/Route Source


Default Administrative Distance  Value

Directly Connected

0

Static Route

1

Enhanced Interior Gateway Routing Protocol (EIGRP) Summary  Route

5

Exterior Boarder Gateway Protocol (eBGP)

20

Internal EIGRP

90

IGRP

100

OSPF

110

IS-IS

115

RIP

120

On demand Routing (ODR )

160

External EIGRP

170

iBGP

200

Unknown

255

 

 

Filed Under: Routing General

Tags:

About the Author:

RSSComments (7)

Leave a Reply | Trackback URL

  1. Gravina says:

    Thanks for every other informative website. Where else could I get that kind of info written in such an ideal method? I have a venture that I am just now operating on, and I’ve been at the glance out for such information.

  2. Alex says:

    nice site, Thanks for sharing administrative distances for all Routing protocols

  3. Farmer Joe says:

    nice site pal

  4. Cedrick Mortin says:

    You have wonderful well written articles. Thanks for covering about all Routing protocols

  5. Glapion says:

    Thanks a lot!

  6. Lenny says:

    Thanks for your your content really interesting. We love our Kindle and the best site for tips and tricks is coolkindles.

  7. Blaine says:

    This is really interesting, You are a very skilled blogger. I’ve joined your feed and look forward to seeking more of your fantastic post.

Leave a Reply




If you want a picture to show with your comment, go get a Gravatar.