An enterprise router receives its default route via an eBGP session established with ISP-A. A network administrator attempts to configure a secondary floating static backup default route pointing to ISP-B using the following command:
`ip route 0.0.0.0 0.0.0.0 198.51.100.2 15`
Assuming the eBGP session remains active and continues advertising the default route, which outcome will occur on the router?
- The static route will immediately enter the routing table and replace the eBGP default route as the primary path.Cevap
- BThe static route will remain inactive in the routing table until the primary eBGP neighbor session drops.
- CThe router will perform equal-cost load balancing between the eBGP peer and the static route next-hop.
- DCisco IOS will reject the command because administrative distance values below 20 are reserved for internal system protocols.
Cevap
The static route will immediately enter the routing table and replace the eBGP default route as the primary path.
In Cisco IOS, route selection between different protocol sources is determined by Administrative Distance (AD), where lower values are preferred. The default AD for External BGP (eBGP) is 20. Because the engineer configured the static route with an AD of 15, the router considers the static path more trustworthy than the eBGP path (). Consequently, the static route immediately takes precedence in the routing table, failing to function as a floating backup.
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Floating Static Route Administrative Distance Requirements
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