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Difficulty: MediumFloating Static Routes

A network administrator needs to configure a floating static backup route on a Cisco router to reach the destination subnet 192.168.50.0/24192.168.50.0/24 via the next-hop IP address 10.0.12.210.0.12.2. The primary path to this network is currently dynamically learned via OSPF. Which command correctly configures the floating static route so that it only enters the routing table when the OSPF route fails?

  1. ip route 192.168.50.0 255.255.255.0 10.0.12.2 120Answer
  2. B
    ip route 192.168.50.0 255.255.255.0 10.0.12.2 90
  3. C
    ip route 192.168.50.0 255.255.255.0 10.0.12.2 110
  4. D
    ip route 192.168.50.0 255.255.255.0 10.0.12.2

Answer

The command 'ip route 192.168.50.0 255.255.255.0 10.0.12.2 120' correctly configures the floating static route by setting an administrative distance of 120, which is greater than OSPF's default administrative distance of 110.
The correct command specifies an administrative distance of 120 at the end of the static route definition. Because OSPF has a default administrative distance of 110, Cisco IOS will prefer the OSPF route and keep the static route out of the active routing table (floating) until the OSPF route is removed.

Step-by-Step Solution

1
Identify the Administrative Distance (AD) of the primary routing protocol.
OSPF has a standard default Administrative Distance of 110 on Cisco IOS devices.
Floating static routes rely on AD comparisons to determine route preference.
2
Determine the required Administrative Distance for the floating static route.
The backup static route must have an AD strictly greater than 110 (e.g., 120).
Cisco routers prefer routes with lower AD values; setting a higher AD keeps the route out of the routing table until the primary route fails.
3
Verify Cisco IOS static route syntax.
The syntax 'ip route <prefix> <mask> <next-hop-ip> <distance>' is satisfied by appending 120 at the end of the command.
Appending an integer after the next-hop address specifies a custom Administrative Distance.

Key Concept

Floating Static Route Administrative Distance Calibration
Estimated Time:1m 0s
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Topics

Floating Static Routes

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