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Difficulty: MediumFloating Static Routes

A network engineer is configuring a backup static route on a Cisco router for the destination network 10.100.4.0/2410.100.4.0/24. The primary path to this network is currently learned dynamically via internal EIGRP, which uses a default Administrative Distance of 9090. The engineer needs the static route to remain inactive in the routing table unless the EIGRP path fails. Which command correctly configures this floating static route?

  1. ip route 10.100.4.0 255.255.255.0 192.168.12.2 130Answer
  2. B
    ip route 10.100.4.0 255.255.255.0 192.168.12.2 80
  3. C
    ip route 10.100.4.0 255.255.255.0 192.168.12.2
  4. D
    ip route 10.100.4.0 255.255.255.0 192.168.12.2 90

Answer

The command specifying an administrative distance of 130 correctly configures the floating static route.
A floating static route requires an Administrative Distance (AD) value higher than that of the primary route protocol. Because internal EIGRP uses a default AD of 90, specifying an AD of 130 ensures the static route remains out of the IP routing table until the primary EIGRP route fails.

Step-by-Step Solution

1
Identify the Administrative Distance (AD) of the primary routing protocol.
Internal EIGRP has a default AD of 90.
Floating static routes rely on AD precedence to remain dormant while the primary path is operational.
2
Determine the required Administrative Distance for the floating static route.
The static route must be assigned an AD value strictly greater than 90 (e.g., 130).
Cisco IOS prefers routes with lower AD values. Assigning an AD higher than 90 ensures the static route is installed into the routing table only if the EIGRP route is withdrawn.
3
Evaluate the syntax options for the correct trailing AD value.
The command 'ip route 10.100.4.0 255.255.255.0 192.168.12.2 130' correctly appends the custom AD 130.
It successfully creates a floating static backup route.

Key Concept

Floating Static Routes and Administrative Distance
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Topics

Floating Static Routes

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