3/20/2015 NotesonAdministrativeDistanceandMetric~SysnetNotes

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Notes on Administrative Distance and Metricby Shabeer ibm

Routing protocols uses metrics for calculating best path for a remote network.Distance vector routing protocols use distance (usually hop-count) as their metric.Link state protocols utilize some sort of cost as their metric. Only routes with thebest metric are added to the routing table.

If multiple equal-metric routes exist to a particular network, most routing protocolswill load-balance. If your router is running multiple routing protocols,Administrative Distance is used to determine which routing protocol to trust themost. Routing protocol with Lowest administrative distance wins.

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3/20/2015 NotesonAdministrativeDistanceandMetric~SysnetNotes

http://sysnetnotes.blogspot.in/2013/06/notesonadministrativedistanceand.html 2/5

A route with an unknown Administrative Distance will never be inserted intothe routing table.For example consider a router is configured with two routingprotocolsOSPFandEIGRP. Since EIGRP has lower AD value of 90 when compared tothat of OSPF which is 110, the router chooses the path derived byEIGRP. If weconfigure a static route with EIGRP, router chooses static route because its AD valueis 1.

The Administrative distance can be configured manually and it can override defaultadministrative distance values.

Changing default administrative distance values

RIPRouter(config)#router ripRouter(config-route)#distance < 220>

EIGRPRouter(config)#router eigrp 111Router(config-route)#distance eigrp [internal Ad value and externalAd value]

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3/20/2015 NotesonAdministrativeDistanceandMetric~SysnetNotes

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OSPFRouter(config)#router OSPF 100Router(config-route)#distance < 90>

NOTE : To go back to default administrative distance in above protocols use nodistance command

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AnonymousDecember 13, 2013 at 9:39 PM

Thanks

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