This text field gives the human-readable explanation that accompanies the remote-call error code for the FSM workflow tracked by the finite-state-machine object that drives the port-discovery workflow for a fabric-interconnect port. An administrator reads rmtErrDescr on this PortDiscoverFsm instance to understand a failure in plain language before deciding whether the fix is local (cabling, config) or requires escalation. For example, rmtErrDescr might describe a peer component that failed to respond, telling the operator to check the far end of the link rather than this switch alone.