How to upgrade a cluster system of S series switches

When upgrading the software on the S series switch cluster, restart the cluster or use the quick upgrade mode. You cannot upgrade a single switch in a cluster.
The quick upgrade provides a mechanism to ensure uninterrupted service forwarding during the upgrade, minimizing the impact of the upgrade on services. This upgrade method applies to scenarios sensitive to the service interruption time.
The steps are as follows:
1. Load the new system software to the active SRU of the cluster.
2. Run the startup system-software system-file all command to configure the software file name all the SRUs use for next startup.
In this process, the system software is copied from the active SRU to other SRUs.
3. Run the reboot command to restart the cluster.
Or run the css fast upgrade command to perform a quick upgrade for the cluster.

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