Parks-and-recreation cutover took the civic VLAN down when spanning tree reconverged on the physical fabric. How does overlay virtual networking address that traditional Layer-2 challenge?
Select an answer to reveal the explanation.
Short Explanation
Spanning tree is like one citywide drawbridge: when it lifts for a parks cutover, the whole VLAN waits. Overlay tunnels hop an IP street grid instead of stretching one giant Layer-2 island, so tenant networks no longer live and die with STP reconvergence. Carbon Black and Horizon do not replace that overlay design.
Full Explanation
Traditional stretched VLANs depend on Spanning Tree Protocol to keep Layer-2 loops from flooding the physical fabric. An NSX-T overlay encapsulates tenant frames and forwards them across a routed IP underlay, so each logical segment does not require a citywide STP domain. That reduces reconvergence outages during civic cutovers without turning the physical core into a Layer-2 mesh for every department. Horizon desktop pools and Carbon Black isolation are sibling-product controls, not the SDN overlay that avoids stretched STP.