How can I change the stack priority on CE switches

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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

Other related questions:
How can I configure LACP priority on CE switches
LACP priorities include system and interface priorities. 1. The system priority determines the Actor and Partner. The device with a higher system priority functions as the Actor and the active interfaces are selected based on the Actor. 2. The interface priority determines selection of active interfaces. The interfaces with a higher priority are selected as active interfaces. A smaller value indicates a higher priority. # Configure the LACP system priority. system-view [~HUAWEI] lacp priority 10 [*HUAWEI] commit# # Configure the LACP priority for 10GE1/0/1. system-view [~HUAWEI] interface eth-trunk 1 [*HUAWEI-Eth-Trunk1] trunkport 10ge 1/0/1 [*HUAWEI-Eth-Trunk1] mode lacp-static //Before configuring the interface priority, ensure that the interface has been added to an Eth-Trunk in LACP mode. [*HUAWEI-Eth-Trunk1] quit [*HUAWEI] interface 10ge 1/0/1 [*HUAWEI-10GE1/0/1] lacp priority 1 [*HUAWEI-10GE1/0/1] commit

How to upgrade a stack of CE switches
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.

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