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Cisco MDS 9000 Family NX-OS Interfaces Configuration Guide
OL-29284-01, Release 6.x
Chapter 2 Configuring Interfaces
Configuring Interfaces
Configuring System Default Port Mode F
The system default switchport mode F command sets the administrative mode of all Fibre Channel
ports to mode F, while avoiding traffic disruption caused by the formation of unwanted Inter-Switch
Links (ISLs). This command is part of the setup utility that runs during bootup after a write erase or
reload. It can also be executed from the command line in configuration mode. This command changes
the configuration of the following ports to administrative mode F:
• All ports that are down and that are not out-of-service.
• All F ports that are up, whose operational mode is F, and whose administrative mode is not F.
This command does not affect the configuration of the following ports:
• All user-configured ports, even if they are down.
• All non-F ports that are up; however, if non-F ports are down, this command changes the
administrative mode of those ports.
Restrictions
• To ensure that ports that are part of ISLs do not get changed to port mode F, configure the ports in
port mode E, rather than in Auto mode.
• When the command is executed from the command line, switch operation remains graceful. No ports
are flapped.
Detailed Steps
To set the administrative mode of Fibre Channel ports to mode F in the CLI, follow these steps:
Note For detailed information about the switch setup utility, see the Cisco MDS 9000 Family NX-OS
Fundamentals Configuration Guide.
Example 2-1 shows the command in the setup utility, and Example 2-2 shows the command from the
command line.
Example 2-1 Setup Utility
Configure default switchport mode F (yes/no) [n]: y
Example 2-2 Command Line
switch(config)# system default switchport mode F
Command Purpose
Step 1
switch# config t
Enters configuration mode.
Step 2
switch(config)# system default
switchport mode F
Sets the administrative mode of Fibre Channel ports to
mode F (if applicable).
switch(config)# no system default
switchport mode F
Sets the administrative mode of Fibre Channel ports to
the default (unless user configured).
