Routing Protocols Administrative Distance

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Last updated 3:10 PM on 4/19/26
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13 Terms

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Lower AD

More trusted/preferred

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Higher AD

Less trusted/preferred

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Connected default AD

0

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Static default AD

1

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External BGP default AD

20

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EIGRP default AD

90

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OSPF default AD

110

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IS-IS Default AD

115

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RIP default AD

120

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How preferred routes are selected

  1. Prefix/length (highest subnet mask)

  2. Lowest administrative distance (routing protocol preference)

  3. Metric/cost

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Equal cost multi path

Lets routing protocols load balance across equal-cost routes

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Floating static routes

Backup route with a higher AD value in case the dynamic routing protocol fails

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Passive interfaces

Advertised so other routers can get to them, but they won’t form adjacencies and won’t receive internal network information

  • Used for external routers we don’t want to send internal info to

  • Best practice is to make loopback interfaces passive interfaces