A network design shows two routers directly connected to an Ethernet switch using optical connections.
There is an OSPF adjacency between the routers.
In this design, which solution will ensure that interface down detection is reported as quickly as possible to the IGP?
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A. B. C. D. E.B.
In a network design where two routers are directly connected to an Ethernet switch using optical connections and an OSPF adjacency exists between the routers, the solution that ensures interface down detection is reported as quickly as possible to the IGP is Bidirectional Forwarding Detection (BFD).
BFD is a lightweight protocol that provides fast detection of link and path failures. It works by periodically sending BFD control packets between routers over a link, and detecting a failure if no response is received within a specified time interval. BFD can detect failures in as little as a few milliseconds, which is much faster than the convergence time of traditional IGP mechanisms such as OSPF.
While optimized OSPF SPF timers and LSA timers can improve the speed of convergence in an OSPF network, they are not designed specifically for interface down detection and may still result in longer convergence times than BFD. Automatic protection switching (APS) and Ethernet OAM CFM monitoring are also not directly related to interface down detection and may not provide the same level of detection speed as BFD.
Therefore, the best solution for ensuring fast interface down detection in this network design is Bidirectional Forwarding Detection.