How to upgrade a cluster system of S series switches

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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.

Other related questions:
Clusters or stacks of S series switches
A stack or cluster of S series switches is a logical switch consisting of multiple stacking-capable or clustering-capable S series switches. In V200R001C00 and earlier versions, S series switches only set up stacks. In later versions, S series fixed switches set up stacks, and S series modular switches set up clusters. Please ask questions about specific switch models. The following information is possibly related to your question:

Bootrom upgrade on S series switch
For S series switches except S1700 switches, the BootROM file is used to start boards. The version numbers of the BootROM is in ascending order. The greater the version number, the later the version. A later version is compatible with earlier versions. For example, if the BootROM version that matches the product version is 109, all the BootROM versions later than 109 can be used. Load the BootROM file to the flash memory of a device through the serial port. For S series modular switches, you can perform the following steps to upgrade the BootROM version online: 1. Upload the system software package containing a new BootROM version to the CF card or the flash memory through FTP. 2. Run the upgrade command to load the BootROM online. For details, see the Command Reference. Note: The corresponding board must be registered before online upgrade. For S series fixed switches running V200R001 or a later version, run the upgrade basic-bootrom filename [ slot slot-id ] command in the diagnostic view to upgrade the BootROM version. Note: Before running this command, read the related release notes and ensure that the new BootROM version is compatible with the VRP software version. Do not upgrade the BootROM if the two versions are incompatible, and perform operations as instructed.

Upgrade stacks of S series fixed switches
You can upgrade a stack of S series fixed switches using either of the following methods: Traditional upgrade: All member switches in the stack need to restart. This upgrade method causes service interruption in a relatively long time and can be used in scenarios insensitive to the service interruption time. Upgrade procedure 1. Upload system software to the master switch in the stack. 2. Run the startup system-software system-file all command to set the next startup software for all member switches in the stack. 3. Run the reboot command to upgrade the stack by restarting the entire system. Smooth upgrade: Member switches in a stack can be divided into an active area and a backup area that back up each other. Member switches in the two areas are upgraded in turn. During the upgrade of an area, traffic is transmitted through the other area, minimizing the impact of the upgrade on services. This upgrade method applies to scenarios sensitive to the service interruption time. The stack and networking must meet the following requirements: The uplinks and downlinks work in redundancy mode. The system software for next startup supports the smooth upgrade function. Member switches in the stack are running the same system software with the same software package name, version, and path. Member switches in the stack have the same system software for next startup with the same software package name, version, and path. Upgrade procedure 1. Upload system software to all the member switches in the stack. Ensure that member switches have the same system software with the same software package name, version, and path. 2. Run the system-view command to enter the system view. 3. Run the upgrade backup-area slot slot-id to slot-id command to define the active and backup areas for a smooth upgrade. The member switches with stack IDs in the specified range join the backup area, and the other member switches automatically join the active area. Note: Follow these rules to define the active and backup areas in a stack: The active and backup areas cannot contain the same member switch, and both areas must have at least one member switch. The backup area cannot contain the master switch. Member switches in each area must be directly connected. Member switches in the active and backup areas form the entire stack. 4. (Optional) Run the display upgrade area command to check whether the configured areas meet the requirements of the current stack topology. If the stack topology changes after the areas are configured, the smooth upgrade will fail. To avoid this problem, check the area configuration before starting a smooth upgrade. If the areas fail the check, redefine the active and backup areas correctly according to the current stack topology. 5. Run the upgrade start command to enable a smooth upgrade. 6. (Optional) Run the display upgrade state [ slot slot-id ] command to check the smooth upgrade status.

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