proc CheckTrafficState {} {
    # This API is mainly used by VerifyTrafficState.
    # Users can also use this in their scripts to check traffic state.

    # startedWaitingForStats, startedWaitingForStreams, started, stopped, stoppedWaitingForStats, txStopWatchExpected, locked, unapplied

    set currentTrafficState [ixNet getAttribute [ixNet getRoot]/traffic -state]

    switch -exact -- $currentTrafficState {
	::ixNet::OK {
	        return notRunning
	}
	stopped {
	        return stopped
	}
	started {
	        return started
	}
	locked {
	        return locked
	}
	unapplied {
	        return unapplied
	}
	startedWaitingForStreams {
	        return startedWaitingForStreams
	}
	startedWaitingForStats {
	        return startedWaitingForStats
	}
	stoppedWaitingForStats {
	        return stoppedWaitingForStats
	}
	default {
	        return $currentTrafficState
	        puts "\nError CheckTrafficState: Traffic state is currently: $currentTrafficState\n"
	        return 1
	}
    }
}