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External Control Plane

content/en/docs/reference/glossary/external-control-plane.md

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An external control plane is a control plane that externally manages mesh workloads running in their own clusters or other infrastructure. The control plane may, itself, be deployed in a cluster, although not in one of the clusters that is part of the mesh it's controlling. Its purpose is to cleanly separate the control plane from the data plane of a mesh.