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Zorluk: ZorIPv4 Static Routing

Router Edge-1 is connected to a primary service provider using external BGP (eBGP, Administrative Distance 20) and a secondary service provider using an IPv4 static route to reach destination network 192.168.100.0/24192.168.100.0/24. The network engineer intends for the static route to serve strictly as a floating backup path that only activates if the primary eBGP route fails. During a routing table audit, the engineer discovers that the static route is active in the routing table even while the primary eBGP link is fully operational.

The current static route configuration on Edge-1 is:
`ip route 192.168.100.0 255.255.255.0 10.0.12.2 15`

Which configuration change on router Edge-1 will ensure that the static route functions correctly as a backup path?

  1. Reconfigure the static route as `ip route 192.168.100.0 255.255.255.0 10.0.12.2 25` so its administrative distance exceeds that of eBGP.Cevap
  2. B
    Reconfigure the static route as `ip route 192.168.100.0 255.255.255.0 10.0.12.2 10` to lower its administrative distance further.
  3. C
    Remove the distance argument so the command reads `ip route 192.168.100.0 255.255.255.0 10.0.12.2` to enable automatic floating behavior.
  4. D
    Reconfigure the route using a wildcard mask as `ip route 192.168.100.0 0.0.0.255 10.0.12.2 15` while retaining distance 15.

Cevap

Reconfigure the static route as `ip route 192.168.100.0 255.255.255.0 10.0.12.2 25` so its administrative distance exceeds that of eBGP.
A floating static route serves as a backup path and must have an Administrative Distance (AD) configured higher than that of the primary route source. Since eBGP routes have a default AD of 20, setting the static route's AD to 25 ensures it will only be installed into the routing table if the primary eBGP route fails.

Adım Adım Çözüm

1
Identify the Administrative Distance (AD) of the primary routing protocol.
eBGP has a default Administrative Distance of 20.
Administrative Distance measures route trustworthiness; lower AD values are preferred by the routing table.
2
Analyze why the current static route is active in the routing table.
The current static route has an explicit AD of 15, which is lower than eBGP (20).
Because 15 < 20, the router selects the static route as the primary path instead of treating it as a backup.
3
Determine the AD requirement for a floating static route.
The static route's AD must be set to a value strictly greater than 20 (e.g., 25).
Setting the AD higher than the primary routing protocol ensures the static route remains inactive in the RIB until the primary eBGP route is withdrawn.

Anahtar Kavram

Floating Static Route Administrative Distance Calibration
Tahmini Süre:2m 0s
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Konular

IPv4 Static Routing

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