This gauge holds the numeric error code returned by a remote invocation that the FSM running on the port-discovery object that runs the neighbor-discovery process for a fabric-interconnect port made as part of its workflow. An administrator diagnosing a failed discovery or configuration step on this PortDiscover instance uses fsmRmtInvErrCode to identify precisely which remote-call failure the FSM hit, rather than only knowing that something failed. For example, a non-zero fsmRmtInvErrCode on this PortDiscover would be the first clue an operator pulls before searching Cisco's error-code reference to find the underlying cause.