Foglight reports the "Non-Link Error Rate" (per-port) from what it collects from the Brocade's "err_bad_os (Invalid Ordered Set)" metric (among others) and this can be quite high (10s of millions). The err_bad_os counter specifically is not a critical error and can be ignored.
The command portstatsshow <portnumber>, on the Brocade, will show the metric err_bad_os / InvalidOrderedSet.
Note: High values for the err_bad_os counter, while not serious in and of themselves, might be masking other other non-link errors on the port
To reduce the Non-link error rate run the following per port on the Brocade: