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Which statement about scalability in Cisco OTV is true?
A. The control plane avoids flooding by exchanging MAC reachability.
B. IP-based functionality provides Layer 3 extension over any transport.
C. Any encapsulation overhead is avoided by using IS-IS.
D. Unknown unicasts are handled by the authoritative edge device.
Correct Answer: A
Explanation/Reference:
Explanation:
Cisco calls the underlying concept of OTV traffic forwarding “MAC routing”, since it behaves as if you are routing Ethernet frames over the DCI transport.
OTV uses a control plane protocol to proactively propagate MAC address reachability before traffic is allowed to pass, which eliminates dependency on flooding mechanism to either learn MAC addresses or forward unknown unicasts.