How to upgrade a stack of CE switches

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A stack can be upgraded using the traditional upgrade method (specify the next-startup files and restart the entire stack) or the fast upgrade function. The fast upgrade function applies to a stack with two member switches. 

Stack restart:

1. Upload the new system software to the master switch and copy it to all other member switches. If the switch has multiple MPUs, you also need to copy the system software to all MPUs.
2. Run the startup system-software system-file all command to specify the system software file name for the next startup.
3. Run the reboot command to restart the stack.

Fast upgrade:

1. Upload the new system software to the master switch and copy it to all other member switches. If the switch has multiple MPUs, you also need to copy the system software to all MPUs.
2. Run the startup system-software system-file all command to specify the system software file name for the next startup.
3. Run the system-view command to enter the system view.
4. Run the stack command to enter the stack management view.
5. Run the stack upgrade fast command to start a fast upgrade.
After performing a fast upgrade, you can run the display stack upgrade status command to check the upgrade status.

Other related questions:
How to split a CE switch stack
If a stack is not required, split the stack to restore the member switches to standalone switches.
Split a CE12800 stack.
1. Disable the CSS function. After the CSS function is disabled, the member switches restart without a configuration file and automatically back up the CSS configuration file used before the CSS splits.
system-view
[~HUAWEI] stack
[~HUAWEI-stack] undo stack enable memeber all
2. Remove stack cables.

Split a stack of CE8800&CE7800&CE6800&CE5800 switches.
1. Back up the stack configuration file in case that the stack will be used again.
copy stack.cfg stack_copy.cfg all
2. Clear the configuration file for next start and restart the switch.
reset saved-configuration
The configuration will be erased to reconfigure.Continue? [Y/N]: y
reboot
Warning: The current configuration will be saved to the next startup saved-configuration file. Continue? [Y/N]: n
Warning: The system will reboot. Continue? [Y/N]: y
3. Remove stack cables.

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.

How can I change the stack priority on CE switches
During master switch election in a stack, the member switch with the highest stack priority becomes the master switch.
After setting a stack priority, restart the switch for the configuration to take effect.
Change the stack priority of a CE12800 switch.
- Before CSS is enabled
system-view
[~HUAWEI] stack
[~HUAWEI-stack] stack priority 150
[*HUAWEI-stack] commit
- After CSS is enabled
system-view
[~HUAWEI] stack
[~HUAWEI-stack] stack member 1 priority 150
[*HUAWEI-stack] commit

Change the stack priority of CE8800&CE7800&CE6800&CE5800 switches.
system-view
[~HUAWEI] stack
[~HUAWEI-stack] stack member 1 priority 150
[*HUAWEI-stack] commit

How to add a stack member CE switch
To add a member switch to a stack, perform the following operations: 1. Upgrade the software version of the switch to the current stack system version to prevent multiple restarts resulted from version synchronization and speed up stack setup. 2. Complete the stack configuration of the switch, save the configuration, and then power off the switch. 3. Connect the switch to the stack using stack cables. 4. Power on the switch to enable it to join the stack without affecting the stack.

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