Hi Alaahegga, What frame errors are you seeing? It is will tough to diagnose without more information. It could be many issues. typically we have seen CRC errors causing issues on the brocade switches. It could also be due to Head of the Line blocking issues due to congestion in your fabric due to their switch architecture. We have see CRC errors and HOL issues care much grief in customers environments before. It may or may not be the errors that you are seeing in you environment. It will be tough to diagnose without more data on the type of errors you are seeing.