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Difficulty: EasyFloating Static Routes

A network administrator needs to configure a backup floating static route for destination network 10.30.0.0/16 via next-hop IP 192.168.10.2. The primary route to this destination is learned via internal EIGRP, which has a default administrative distance of 90. What is the minimum administrative distance value that must be specified at the end of the command to ensure the route acts as a backup?

Answer:`Router(config)# ip route 10.30.0.0 255.255.0.0 192.168.10.2 【91】`

Answer

91
To configure a floating static route, the administrative distance (AD) appended to the end of the `ip route` command must be higher than the AD of the primary route. Because internal EIGRP has an administrative distance of 90, the minimum integer value required to make the static route act as a backup is 91.

Step-by-Step Solution

1
Identify the administrative distance (AD) of the primary routing protocol.
Internal EIGRP has a default Administrative Distance of 90.
Floating static routes rely on administrative distance values to determine route preference in the Cisco IOS routing table.
2
Determine the required administrative distance for the backup static route.
The floating static route must have an AD strictly greater than 90.
A route with a lower AD is always preferred. Standard static routes have a default AD of 1, which would override EIGRP if not changed.
3
Calculate the minimum integer value.
The lowest integer greater than 90 is 91.
Setting the AD to 91 ensures EIGRP is preferred under normal operations while allowing the static route to take over if EIGRP fails.

Key Concept

Floating Static Route Administrative Distance Configuration
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Topics

Floating Static Routes

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