What is the cause of an "unreachable" state in NSX-T?

The "unreachable" state in NSX-T is typically caused by network configuration issues or service failures. This state indicates that a particular component or resource within the NSX-T environment cannot be accessed or communicated with due to problems in the network settings or operational services.

When network configurations are incorrect—such as misconfigured routing, VLAN assignments, or connectivity settings—it can prevent components from reaching each other, leading to an unreachable state. Similarly, if a critical service that NSX-T relies on fails, it can disrupt communication pathways, causing components that depend on that service to appear as unreachable.

Understanding this concept is crucial for troubleshooting and maintaining proper functionality within an NSX-T environment. Addressing these configuration issues or resolving service failures can restore connectivity and bring components back to a reachable state.