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Difficulty: MediumFloating Static Routes

Company router R1 currently reaches the remote subnetwork 192.168.50.0/24192.168.50.0/24 via internal EIGRP, which has a default Administrative Distance of 90. A network administrator wants to configure a backup floating static route to 192.168.50.0/24192.168.50.0/24 through the next-hop IP address 172.16.1.2. The floating route must remain inactive in the routing table until the primary EIGRP path becomes unavailable. Which Cisco IOS command correctly configures this floating static route?

  1. ip route 192.168.50.0 255.255.255.0 172.16.1.2 95Answer
  2. B
    ip route 192.168.50.0 255.255.255.0 172.16.1.2 85
  3. C
    ip route 192.168.50.0 255.255.255.0 172.16.1.2
  4. D
    ip route 192.168.50.0 255.255.255.0 172.16.1.2 90

Answer

The command 'ip route 192.168.50.0 255.255.255.0 172.16.1.2 95' correctly configures the floating static route.
A floating static route functions as a backup route by configuring an Administrative Distance (AD) higher than that of the primary routing source. Internal EIGRP has a default AD of 90. Configuring the static route with an AD of 95 ensures that Cisco IOS keeps the static route inactive in the routing table during normal conditions, activating it only if the primary EIGRP path fails.

Step-by-Step Solution

1
Identify the Administrative Distance (AD) of the primary routing source.
Internal EIGRP has a default Administrative Distance of 9090.
Floating static routes rely on administrative distance values to determine primary vs. backup paths.
2
Determine the required Administrative Distance for the backup floating static route.
The administrative distance must be set to a value greater than 9090 (such as 9595).
Cisco IOS prefers routes with lower administrative distance values. Setting a value higher than 9090 keeps the static route out of the routing table while the EIGRP route is active.
3
Construct the static route CLI command including the destination IP, subnet mask, next-hop IP, and trailing AD parameter.
The resulting command is 'ip route 192.168.50.0 255.255.255.0 172.16.1.2 95'.
The trailing numeric argument defines the custom administrative distance for the static route.

Key Concept

Floating Static Route Configuration and Administrative Distance
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Topics

Floating Static Routes

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