An administrator intends to deploy a floating static route on router R1 to serve as a backup path for internal network , which is primarily learned via Internal EIGRP (administrative distance 90). Following the configuration, traffic immediately shifts to the secondary link despite the primary link remaining fully operational.
Which configuration mistake caused the static route to preempt the primary EIGRP route in the routing table?
- The static route was assigned an administrative distance value lower than 90, causing it to take precedence over the EIGRP route.Cevap
- BThe static route was configured with an administrative distance of 110, which automatically overrides Internal EIGRP routes.
- CThe static route omitted the next-hop IP address and specified an egress interface, forcing an administrative distance of 0.
- DThe static route lacked an IP SLA track object, which is mandatory for floating static routes to remain inactive.
Cevap
The static route was assigned an administrative distance value lower than 90, causing it to take precedence over the EIGRP route.
Cisco IOS routers evaluate Administrative Distance (AD) to determine which routing source to trust when multiple sources offer routes to the exact same destination prefix. Lower AD values are preferred. Internal EIGRP has a default AD of 90. For a static route to serve as a floating backup, its AD must be configured to a value strictly greater than 90 (e.g., 95 or 130). If the administrator configures an AD lower than 90 (or omits the AD parameter, which defaults to 1), the static route will be preferred over EIGRP and immediately installed into the routing table as the active route.
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Administrative Distance Precedence in Floating Static Routes