public function getServersCredentials($connection = null)
    {
        $connection = $this->sanitizeConnection($connection);
        $available = $this->connections->getAvailableConnections();

        // Get and filter servers
        $servers = Arr::get($available, $connection->name.'.servers');
        if ($this->hasCommand() && $allowed = $this->command->option('server')) {
            $allowed = explode(',', $allowed);
            $servers = array_intersect_key((array) $servers, array_flip($allowed));
        }

        return $servers;
    }