Overview

NOTEs:

Due to ASIC limitation, there are some 100GE interfaces on certain platforms do not support port splitting. For details, see Limitation of Port Breakout.

Certain 100GE and 40GE optical interfaces can be used as a single interface or split into four independent interfaces. The 40GE interface can be split into four independent and logical 10 Gigabit Ethernet interfaces. The 100GE interface can be split into four independent and logical 25 Gigabit Ethernet interfaces or four 10 Gigabit Ethernet interfaces.

You can use set interface gigabit-ethernet <port-name> breakout true command to enable port splitting, use set interface gigabit-ethernet <port-name> breakout false command to merge four interfaces into one interface.

Configuring Port Breakout and Port Merge

To configure port breakout for the 40GE or 100GE interfaces of the switch, the procedures are described as below.

Step 1 Split the interface as required.

set interface gigabit-ethernet <port-name> breakout true

NOTEs:

When you want to cancel the interface split, use set interface gigabit-ethernet <port-name> breakout false command to restore four interfaces to one interface.
The interface name is modified after port breakout or merge, that is the original interface does not exist, and you must manually delete the configurations associated with the original interfaces before restarting system, to make sure that the configuration file can be loaded normally when system boots up.
The 100GE interface can be split into four 25G or four 10G Ethernet interfaces. By default, the 100GE interface is split into four 25G Ethernet interfaces. If you want to further split 25G Ethernet interfaces into 10G Ethernet interfaces, configure the speed to 10G through CLI after port breakout. For detailed information of configuring interface speed, see Interface Rate Configuration. Note: The speed of the split four interfaces is required to be consistent.

Step 2 Commit the configuration.

commit

Step 3 Enter the Linux shell mode, and restart PICOS to make the setting take effect.

sudo systemctl restart picos

Step 4 Verify the configuration.

For example, split the 40GE interface xe-1/1/25 into four 10GE interfaces and run run show interface brief command to view the interface information after system startup.

admin@PICOS# set interface gigabit-ethernet xe-1/1/25 breakout true
admin@PICOS# commit
Commit OK.
Save done.
Interface breakout setting has been changed, please reboot the system for changes to take effect!
Make sure to delete all the configurations associated with the unavailable interfaces, otherwise loading startup configuration will fail.
admin@PICOS# exit
admin@PICOS> start shell sh
admin@PICOS:~$ sudo systemctl restart picos
admin@PICOS> configure
admin@PICOS# run show interface brief
Interface   Management  Status  Flow Control  Duplex  Speed    Description

......
xe-1/1/25.1 Enabled     Down    Disabled      Full    Auto     
xe-1/1/25.2 Enabled     Down    Disabled      Full    Auto     
xe-1/1/25.3 Enabled     Up      Disabled      Full    40Gb/s   
xe-1/1/25.4 Enabled     Up      Disabled      Full    40Gb/s   
......