What are the differences between CSS and iStack for CE switches

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Cluster Switch System (CSS) technology is used to set up a stack of modular switches. iStack technology is used to set up a stack of fixed switches. CSS and iStack have different implementation methods but have the same functions.

Other related questions:
Difference between CSS and stack on S series switches
For S series switches, both stack and cluster indicate that combine multiple switches are virtualized into a logical switch. In V200R001C00 and earlier versions, there is only one name called stack in Chinese. In later versions, fixed switches use stack and modular switches use the cluster. Each cluster allows only two member devices, whereas a stack can contain a maximum of nine member devices.

What are differences between command lines on CE and S series switches
Question
What are the command-line differences between CloudEngine series switches and Huawei Ethernet switches?
Solution
Commands on traditional Ethernet switches take effect immediately, while command lines on CE series switches take effect immediately or in two phases.
l Immediate mode: After a user runs a command and presses Enter, the system checks whether the current configuration is different from the previous configuration. If they are different, the system commits the current configuration and generates the configuration rollback point. As a result, multiple configuration rollback points may be generated when one feature is deployed.
To make a command take effect immediately, run the following command in the user view:
<HUAWEI> system-view immediately
Enter system view, return user view with return command.
[HUAWEI]
l In two-stage mode, after a user runs a series of commands, the system checks the differences between the current and previous configurations and generates a configuration rollback point only when the user runs the commit command. This allows the configurations of multiple commands for a service to take effect in batches.
To make a command take effect in two-stage mode, run the following command in the user view:
<HUAWEI> system-view
Enter system view, return user view with return command.
[~HUAWEI]

How do S series modular switches establish a CSS
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