Overview

NOTEs:

For N8550-24CD8D, after the 400GE interfaces are split into two 200GE interfaces, the split interface speed can be furtherly reduced into 100GE through running command set interface gigabit-ethernet speed.
When configuring the split interfaces speed of a certain interface, for N8550-24CD8D, the speed should be consistent; for N9550-64D, N9550-32D and AS9716-32D, the speed can be different.

The 400GE and 200GE optical interface can be used as a single interface or split into two or four independent and logical interfaces. The detailed information is shown as below.

Table 1. Detailed information of split type

Hardware Platform	Panel Interface Type	Optical Module	Split Type

Hardware Platform	Panel Interface Type	Optical Module	Split Type
N9550-64D N9550-32D AS9716-32D	400G	400G	4*100G
N9550-64D N9550-32D AS9716-32D	400G	400G	2*200G
N8550-24CD8D	400G	400G	4*100G
		400G	2*200G
		200G	4*50G
		200G	2*100G
		100G	4*25G
		100G	2*50G
	200G	200G	4*50G
		200G	2*100G
		100G	4*25G
		100G	2*50G

Limitation for N8550-24CD8D

For N8550-24CD8D, it supports thirty-two panel interfaces, which belong to four pipes, that is every eight panel ports (six 200G and two 400G ports) belong to one pipe. For only 18 ports are allowed to be split in one pipe, you need to split interfaces within this limitation. The corresponding relationship of panel ports and pipes is shown as below.

Table 2. Corresponding relationships of panel ports and pipes

pipe0	pipe1	pipe2	pipe3
1, 2, 3, 4, 5, 7, 26, 28	6, 8, 13, 15, 17, 19, 30, 32	9, 11, 18, 20, 21, 23, 27, 29	10, 12, 14, 16, 22, 24, 25, 31

Configuring Port Breakout and Port Merge

To configure port breakout for the 400GE interfaces of the switch, take the following steps:.

Step 1 Enable the port breakout function.

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

Step 2 Split the interface as required. The breakout type is different based on switch models.

For N9550-64D, N9550-32D and AS9716-32D, only 400G interface is supported, and you can specify the breakout type as 4 x 100G or 2 x 200G.

set interface gigabit-ethernet <port-name> breakout-type {4*100G | 2*200G}

For N8550-24CD8D, 400G and 200G interfaces are supported, and you can specify the breakout type as 4 x 100G, 2 x 200G, 4 x 50G, 2 x 100G or 4 x 25G.

set interface gigabit-ethernet <port-name> breakout-type {4*100G | 2*200G | 4*50G | 2*100G | 4*25G}

NOTEs:

For 400G interfaces of N8550-24CD8D, when you specify the breakout type as 2*200G or 4*100G:
- The interface will be split into two 200GE interfaces or four 100GE interfaces with 400G optical module inserted.
- the interface will be split into two 100GE interfaces or four 50GE interfaces with 200G optical module inserted.
- The interface will be split into two 50GE interfaces or four 25GE interfaces with 100G optical module inserted.

For 200G interfaces of N8550-24CD8D:
- When you specify the breakout type as 2*100G or 4*50G, the interface will be split into two 100GE interfaces or four 50GE interfaces with 200G optical module inserted.
- When you specify the breakout type as 4*25G, the interface will be split into four 25GE interfaces with 100G optical module inserted.
- When you specify the breakout type as 2*100G, the interface will be split into two 50GE interfaces with 100G optical module inserted.

To cancel the interface split, use set interface gigabit-ethernet <port-name> breakout false command to restore the split interfaces into one interface.
If you enable the breakout function of interface without configuring the breakout-type, the 400GE interface will be split into four 100G Ethernet interfaces and the 200GE interface will be split into four 50G Ethernet interfaces by default.
The interface name is modified after port breakout or merge, that is the original interface does not exist, and you need to 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.

Step 3 Commit the configuration.

commit

Step 4 Restart PicOS to make the setting take effect. Note: the split interfaces cannot be viewed before restarting PicOS.

sudo systemctl restart picos

Step 5 View the interface information after system startup. You can view the information of split interfaces.

run show interface brief

Configuration Example of Port Breakout

Overview

For N8550-24CD8D, split the 400GE interface into two 200GE interfaces, further reduce the speed of one split interface to 100GE, and view the interface information after system startup.

Procedure

Step 1 Enable the port breakout function.

admin@PICOS# set interface gigabit-ethernet xe-1/1/48 breakout true

Step 2 Specify the breakout type as 2 x 200G.

admin@PICOS# set interface gigabit-ethernet xe-1/1/48 breakout-type 2*200G

Step 3 Commit the configuration.

admin@PICOS# commit

Step 4 Restart PicOS to make the setting take effect.

Step 5 Reduce the speed of split interface xe-1/1/48.1 to 100GE.

Verify the configuration

Use the run show interface brief command to view the interface xe-1/1/1 information after system startup.