HP StorageWorks 8B FC Entry Switch - Manual (Page 20)

Remote Switch
20 HP StorageWorks Remote Switch Version 3.1.x/4.1.x User Guide
Note: The switch must be disabled prior to entering the configure command. Some
network-bridge devices may not have a provision for handling class F frames.
Therefore, the transmission of class F frames throughout the entire Remote Switch
fabric must be suppressed.