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Difficulty: MediumIPv4 Static Routing

An enterprise network administrator is configuring a floating static route on router R1 to serve as a backup path for the corporate subnet 172.16.50.0/24. The primary path is currently learned via internal EIGRP (Administrative Distance 90). Which command correctly configures the backup route so that it remains inactive until the primary EIGRP route fails?

  1. ip route 172.16.50.0 255.255.255.0 10.1.1.2 95Answer
  2. B
    ip route 172.16.50.0 255.255.255.0 10.1.1.2 85
  3. C
    ip route 172.16.50.0 255.255.255.0 10.1.1.2 90
  4. D
    ip route 172.16.50.0 255.255.255.0 10.1.1.2 1

Answer

The command 'ip route 172.16.50.0 255.255.255.0 10.1.1.2 95' correctly configures the floating static route.
A floating static route functions as a backup by having an administrative distance configured higher than that of the primary routing protocol. Internal EIGRP has a default administrative distance of 90. Therefore, assigning an administrative distance of 95 to the static route ensures it stays inactive in the routing table until the primary EIGRP route is withdrawn.

Step-by-Step Solution

1
Determine the Administrative Distance (AD) of the primary dynamic routing protocol.
The primary route is learned via internal EIGRP, which has a default administrative distance of 90.
A floating static route must have an administrative distance higher than the active primary route to serve as an inactive backup.
2
Select an administrative distance value for the static route that exceeds the primary AD.
Specifying an AD of 95 ensures the static route is kept out of the routing table while the EIGRP route remains active.
Cisco IOS installs routes with lower administrative distance values first into the routing table.

Key Concept

Floating Static Routes and Administrative Distance
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Topics

IPv4 Static Routing

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