Dear, Daniel Co

Thank you very much for your reply.
I am really glad that my drawing is right.
I have two questions.

1. It seems to be difficult to update firmware version using internal network. Why should the firmware versions of the switches match? If the firmware version is different, is not the stack possible?

2. Is there anything I need to set up after I plug in the stack cable and turn on all the devices in order? (ex. CLI command)

There is one more question.
Is not there a problem with the service of the switch you are using, other than the one you add when you update firmware or downgrade?
ex. Port settings, LACP, etc.

add contents...
If you look at the N3048 manual
P.240 "How is the Firmware Updated on the Stack?" In the description of the item, "boot autocopy-sw" explains that the firmware will automatically adjust when using this command.

I think that the firmware version of the two installed devices and the switch to be installed this time will be different.

Assuming a firmware update is in progress
Power off the two switches that are currently in use, remove the stack cable,
Do I need to update the firmware for each switch?

It seems to be the last question.
I thank you for your answers to my question.
I go to switch setting on 03/20.
You treated me like a friend, thank you so much.

I will update firmware for all switches.
- Two existing switches (currently in use, connected by stack cable).
- Newly added switches

Question.
1. Is it possible to update the three switches with the latest firmware, connect the switch to the stack cable, and then power on the master device?

2. I wonder if the setting of switches 1 and 2 that were used previously will be initialized when the firmware is update. (Currently 1 and 2 are 10G for switch 2 and are bonded to the server).

If the settings are reset when the firmware is update, I intend to downgrade the firmware using the boot autocopy-sw command on the new switch.

And how do I update the switch's firmware by connecting USB to the USB port next to the OOB port? Is it possible to download the firmware (zip file) on the homepage and proceed?

I saw an update-related PDF file in a Zip file. How many pages do I need to start?

I have a question.
I did not update two stacked existing switches.
In this state, the equipment was turned off and a new switch was connected.
I connected the old switch and the new switch with the stack cable. Then the stack is connected normally and it is usable.

I do not understand.
You told me. "If the firmware of the switches to be stacked are different, the stack is not connected."
But now the stack is normal and there is no problem using it.

If the firmware does not match between the switches connected by the stack cable, what problems do you encounter when using the stack?

This is a very urgent situation.
I have to report this question to my boss.
Please answer fast ..

Hello,

I have two questions,

1) Did you have to power off the switches prior to connecting the third switch?

2) Did you configure the ports on the third switch before connecting it to the stack?

Thanks