Configuring 40 Gbps breakout ports
Use the breakout ethernet command to divide available ICX 7750 40 Gbps ports into four 10 Gbps sub-ports when a breakout cable is
By default, all main 40 Gbps ports are configured to come up in 40 Gbps mode. Once ports are cabled for breakout, configure the ports
using the breakout ethernet command at the global configuration level.
You should remove any interface-level configuration before configuring breakout.
If the device is in cut-through mode and you attempt to configure breakout, an error is returned. Cut-through must be disabled
to return the unit to store-and-forward mode before breakout is configured.
The breakout ethernet command first checks for existing configuration on the port. If existing configuration is detected, an error
message similar to the following is displayed to indicate that prior configuration must be removed.
Device# configure terminal
Device(config)# breakout ethernet 1/1/11
Error: Port 1/1/11 is tagged
Once any previous configuration is removed, the breakout ethernet command must be reissued. The resulting configuration must be
saved, and the unit must then be reloaded before the four 10 Gbps sub-ports are created and accessible
For example, to configure ports 1/3/1 through 1/3/6 for breakout, issue the following commands:
Device(config)# breakout ethernet 1/3/1 to ethernet 1/3/6
For more detail, check Brocade FastIron Management Configuration Guide