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VMware NSX Controller Disconnected Operation Mode

VMware NSX 6.3 introduces a new feature called the Controller Disconnected Operation Mode (CDO) mode that provides additional resiliency for the NSX control plane. Prior to CDO mode, the data plane is still running during the control plane outage, provided there are no changes, such as VM movement from one ESXi host to another ESXi host. If there is a new VM powered on or a VM is vMotioned to a new ESXi host that is not part of the VTEP table, there would be a data plane disruption due to the stale VTEP table.

With the CDO mode, VMs can be vMotioned or powered on during the control plane outage. The CDO mode works for single site deployment, Cross-vCenter deployment, and deployment with the hardware VTEP gateway. The CDO mode targets scenarios where the control plane connectivity is lost to an ESXi host; for example:

The ESXi host has lost connectivity to NSX controllers due to network connectivity or other reasons
The NSX controller cluster is down

There is a good blog post at VMware blogs that walks through how the CDO mode works in detail at https://blogs.vmware.com/networkvirtualization/2017/03/nsx-v-6-3-control-plane-resiliency-cdo-mode.html/.

CDO mode was introduced in NSX 6.3.1 as a tech preview feature and became a GA feature, starting with NSX 6.3.2.