A network engineer is observing the convergence process of an OSPF network after a core router interface experiences a sudden link loss. Arrange the events of link-state convergence into the correct chronological order from first to last.
- 1The local router detects a physical link failure on an active interface.
- 2The router generates an updated Link-State Advertisement (LSA) and floods it to adjacent neighbors.
- 3Neighboring routers receive the LSA and update their local Link-State Database (LSDB).
- 4Routers execute Dijkstra's Shortest Path First (SPF) algorithm using the revised LSDB.
- 5Routers update their Routing Information Base (RIB) with the recalculated next-hop paths.
Answer
The correct chronological sequence of OSPF convergence events is: 1) Physical link failure detection, 2) LSA generation and flooding, 3) Neighbor LSDB update, 4) Dijkstra's SPF algorithm recalculation, and 5) RIB/Routing table path updates.
The convergence process in link-state protocols follows a strict operational order: local failure detection occurs first, followed by LSA creation and flooding to communicate the failure. Next, receiving routers update their local LSDB map, execute Dijkstra's SPF algorithm on the updated database to determine new optimal paths, and finally update the Routing Information Base (RIB) with the newly computed routes.
Step-by-Step Solution
Key Concept
OSPF Link-State Convergence Sequence and SPF Calculation
Estimated Time:1m 30s