How to restore a CSS port to a service port for the CSS composed of S series modular switches

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Perform either of the following operations:
1. In non-CSS scenarios, to restore a physical member port to a service port on a standalone switch, run the undo interface css-port command in the system view.
2. In CSS scenarios, to restore a physical member port to a service port in a CSS, run the shutdown interface ** command in the logical CSS port view (run the interface css-port port-id command to enter the view) to shut down the physical member port and then run the undo port interface ** enable command.

Other related questions:
Are services affected after a CSS composed of S series modular switches splits
When a CSS splits, the two devices work independently, and inter-chassis services are interrupted. If MAD is configured, the physical interfaces of one device will be shut down, and services on the interfaces are interrupted.

How to split a CSS composed of S series modular switches
Perform the following steps to split the CSS of S series modular switches (two standalone switches are restored): 1. Back up the configuration file. (1) Run the save command to save the setting. (2) Run the copy source-filename destination-filename all command to back up the configuration file to the standby switch. Note: Back up the current configuration file to the storage medium of the standby switch before you split the CSS. You can use the configuration file when you set up a CSS next time. 2. Delete the CSS system MAC address. (1) Run the system-view command to enter the system view. (2) Run the undo set css system-mac command to delete the CSS system MAC address. 3. Disable the CSS function. Run the undo css enable all command to disable the CSS function on two member switches. Two standalone switches are restored after they restart. 4. Restore physical member ports to service ports. (This step is required only in service port clustering.) Note: To restore a physical member port to a service port on a standalone switch, run the undo interface css-port command. To restore a physical member port to a service port in a CSS, run the shutdown interface ** command in the logical CSS port view to shut down the physical member port and then run the undo port interface ** enable command. 5. Power off the switches and remove the cluster cables. You can also remove the cluster cables when the switches are running.

What are the restrictions when service ports are configured as CSS ports on S series modular switches
The restrictions are as follows: 1. A card port can be added to only one logical CSS port. 2. On the EH1D2X08SED4 and EH1D2X08SED5 for the S9700, ES1D2X08SED4 and ES1D2X08SED5 for the S7700, and LE2D2X08SED4 and LE2D2X08SED5 for the S9300, at most four ports can be configured as CSS physical member ports. The four physical member ports must be the first four ports (numbered 0 to 3) or the last four ports (numbered 4 to 7) on the LPUs. 3. On the EH1D2X16SFC0/EH1D2X40SFC0/EH1D2X32SSC0/EH1D2X16SSC2 for the S9700, ES1D2X16SFC0/ES1D2X40SFC0/ES1D2X32SSC0/ES1D2X16SSC2 for the S7700, and LE0DX16SFC00/LE0DX40SFC00/LE1D2X32SSC0/LE1D2X16SSC2 for the S9300, a group of four ports must be configured as CSS physical member ports together. For example, ports 0 to 3 or ports 4-7 must be configured together, but ports 2 to 5 cannot be configured together.

Whether the CSS ID of a port can be canceled after S series modular switches establish a CSS
After S series modular switches establish a CSS, interfaces are numbered in the format of CSS ID/slot ID/subcard ID/port. The CSS ID cannot be deleted or cancelled. To delete the CSS ID, you must disable the CSS function.

How to determine the MAC address of a CSS composed of S series modular switches
The MAC address of the master switch is used as the system MAC address of the CSS when the CSS is set up. If you restart the CSS or remove and reinstall another MPU, the system MAC address may change, resulting in service interruptions. To prevent this problem, run the set css system-mac chassis chassis-id command to set the system MAC address to the MAC address of a member switch, ensuring consistency of the system MAC address.

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