How to split a CSS composed of S series modular switches

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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.

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

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.

Troubleshooting mechanism after a CSS of S series modular switches splits
Troubleshooting mechanism: All member switches in a CSS use the same IP address and MAC address (CSS system MAC address). Therefore, after the CSS splits, two CSSs may use the same IP address and MAC address. To prevent this situation, a mechanism is required to check for IP address and MAC address collision after a split and run multi-active detection. It is highly recommended on a network where the CSS is established. MAD handles a multi-active situation in the following way: When detecting two CSS systems (two switches) in Active state, MAD allows only the switch with a higher CSS priority to work. (If the two switches have the same CSS priority, their MAC addresses and CSS IDs are compared in turn.) Then the other switch turns to Recovery state, and all its physical ports except the excluded ones are shut down to prevent the switch from forwarding service packets. For details about the MAD configuration

How to restart the CSS of S series modular switches
After S series modular switches establish a CSS, two devices are virtualized into one logical switch. You can run the reboot command to restart the CSS.

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