Which Interconnectivity method offers the fastest convergence in the event of a unidirectional issue between three Layer 3 switches connected together with routed links in the same rack in a data center?
BFD (Bidirectional Forwarding Detection) provides sub-second failure detection at the control plane level, making it the fastest convergence mechanism for Layer 3 routing protocols.
Fiber Ethernet typically offers higher reliability and lower latency than copper.
When combined, Fiber with BFD provides the most robust and quickest convergence for unidirectional failures in a routed data center environment.
Why other options are incorrect:
A & B: Copper adds more physical susceptibility to errors.
B & D: UDLD is a Layer 2 unidirectional detection mechanism, not optimized for Layer 3 convergence.
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