A network administrator configures R1 with a primary dynamic route learned via OSPF (Administrative Distance ) and a floating static backup route (Administrative Distance ) targeting network . Place the operational steps performed by R1 in the correct chronological sequence following an interface link failure on the primary path.
- 1The physical interface carrying the primary path detects a loss of signal and transitions to a down state.
- 2The OSPF neighbor adjacency breaks, causing R1 to remove the primary OSPF route () from the Routing Information Base (RIB).
- 3R1 evaluates all available candidate routes in its configuration database to identify an active path to .
- 4The floating static route () is validated and installed into the RIB because it now offers the lowest Administrative Distance among valid candidate routes.
- 5R1 updates its Cisco Express Forwarding (CEF) FIB table to forward outbound traffic targeting via the floating static route's next-hop.
Answer
The correct operational sequence begins with link failure detection, followed by OSPF route withdrawal from the RIB, candidate route evaluation by the router, installation of the floating static route into the RIB, and finally updating the CEF FIB table for data plane forwarding.
When a primary link fails, the physical interface status drop triggers OSPF adjacency removal, which withdraws the OSPF route () from the RIB. R1 then evaluates candidate routes and finds the floating static route (). Because no lower AD route exists, R1 installs the floating static route into the RIB and programs the CEF FIB table to direct traffic to the backup next-hop.
Step-by-Step Solution
Key Concept
Floating Static Route Failover & Convergence Order
Estimated Time:1m 30s