Redistribution Notes – AD Manipulation

• Manipulating administrative distance (AD) is another way to help with a mutual redistribution scenario.
• EIGRPs has different ADs for internal and external (redistributed) routes
• OSPF and RIP have the same AD no matter where the route orginated.
• This means that routes redistributed into OSPF may be used instead of a local RIP route.
  • AD 110 (OSPF) beats 120 (RIP) every time.
• The distance subcommand allows you to change the AD on specific routes from specific neighbors.
• This example changes the AD of the route to 10.0.0.0/16 advertised from 1.1.1.1 to 121.
  • This will make this router prefer a RIP route to the same destination.

ip access-list standard RIP-ROUTES permit 10.0.0.0 0.255.255.0 ! router ospf 1 distance 121 1.1.1.1 0.0.0.0 RIP-ROUTES

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ip access-list standard RIP-ROUTES permit 10.0.0.0 0.255.255.0 ! router ospf 1 distance 121 1.1.1.1 0.0.0.0 RIP-ROUTES

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Corrections are encouraged.

Aaron Conaway

I shake my head around sometimes and see what falls out. That's what lands on these pages. @aconaway@mstdn.social

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