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. If you have any questions, the best way to contact me is through Twitter at @aconaway.

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