300-320 Question #452: Real Exam Question with Answer & Explanation

The correct answer is C: By dropping BPDU packets. OTV (Overlay Transport Virtualization) achieves STP isolation between data center sites by dropping all BPDU (Bridge Protocol Data Unit) packets at the OTV edge device. BPDUs are not encapsulated and forwarded across the OTV overlay. This ensures that STP topology events (like to

Question

How does OTV provide STP isolation?

Options

ABy using STP root optimization
BBy using BPDU guard
CBy dropping BPDU packets
DBy using BPDU filtering

Explanation

OTV (Overlay Transport Virtualization) achieves STP isolation between data center sites by dropping all BPDU (Bridge Protocol Data Unit) packets at the OTV edge device. BPDUs are not encapsulated and forwarded across the OTV overlay. This ensures that STP topology events (like topology change notifications or root bridge elections) in one data center cannot propagate to another, keeping the STP domains completely independent. OTV does not use BPDU guard or BPDU filtering in the traditional sense - it simply does not forward BPDUs across the overlay at all.

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