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Difficulty: EasyFloating Static Routes

A network router receives its primary path to a corporate office via external BGP with an administrative distance of 20. Which administrative distance value should be assigned to a static backup route to ensure it functions as a floating static route?

  1. 50Answer
  2. B
    1
  3. C
    10
  4. D
    20

Answer

An administrative distance of 50 should be assigned.
A floating static route must have an administrative distance higher than the primary route so it is ignored by the routing table during normal operation and only installed if the primary route fails. Since the primary eBGP route has an administrative distance of 20, setting the static route's administrative distance to 50 makes it a valid backup route.

Step-by-Step Solution

1
Identify the administrative distance of the primary route.
The primary route is learned via external BGP, which has an administrative distance of 20.
Routing protocols use administrative distance to rank trustworthiness, preferring lower values.
2
Determine the required administrative distance for a floating static route.
The static route must be configured with an administrative distance greater than 20.
Floating static routes act as backups and must remain inactive in the routing table until the primary route with a lower administrative distance becomes unavailable.
3
Select the valid administrative distance option.
50 is greater than 20, making it a valid floating static route distance.
A value of 50 ensures the static route is only placed into the routing table if the eBGP route fails.

Key Concept

Floating static routes require a higher administrative distance than the primary routing protocol to remain inactive as a backup until failover occurs.
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Topics

Floating Static Routes

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