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Difficulty: EasyFloating Static Routes

You are configuring a secondary gateway path on a corporate router for destination subnet 192.168.88.0/24 via next-hop IP address 10.5.5.2. The primary active route is learned dynamically via OSPF, which carries a default administrative distance of 110. What is the lowest administrative distance integer value that must be assigned at the end of the CLI command to ensure this static route functions as a floating backup route?

Answer:ip route 192.168.88.0 255.255.255.0 10.5.5.2 【111】

Answer

111
A floating static route acts as a backup path and only enters the routing table when the primary routing path fails. Because Cisco routers prefer routes with lower administrative distance values, a floating static route must have an administrative distance higher than the primary route protocol. Since OSPF has a default administrative distance of 110, the lowest integer value that makes the static route floating is 111.

Step-by-Step Solution

1
Identify the administrative distance of the primary route.
The primary route is learned via OSPF, which has a default administrative distance of 110.
Cisco routers use administrative distance to rank route trustworthiness, preferring lower values.
2
Determine the minimum administrative distance required for a floating static backup route.
To ensure the static route remains inactive while OSPF is operational, its administrative distance must be strictly greater than 110.
The lowest integer greater than 110 is 111.

Key Concept

Floating Static Route Administrative Distance Selection
Estimated Time:45s
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Topics

Floating Static Routes

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