The command logging logfile Local 4 size 20000 configures the Cisco MDS 9000 Series Switch to store log messages with a severity of "warning" (which corresponds to severity level 4) and above. The size parameter is set to 20000 bytes, which ensures that the log file does not exceed the specified maximum size1. References: * For detailed information on configuring system message logging on Cisco MDS 9000 Family switches, you can refer to the Cisco documentation on system message logging1.