How to change CSS IDs on S series modular switches

Before setting up the CSS, you must run the set css id new-id command to configure different CSS IDs for two devices. new-id can be set to 1 or 2.
After the CSS is set up, run the set css id new-id chassis chassis-id command to change the CSS ID. Ensure that the two switches use different CSS IDs.
After changing the CSS ID, restart the device to make the configuration take effect.

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