Allied Telesis AT-S63 - Manual (Page 178)

Chapter 10: File Downloads and Uploads
178 Section II: Advanced Operations
The following prompt is displayed:
Do you want confirmation before downloading each switch -
> [Yes/No]
7. If you answer Yes to this prompt, the management software prompts
you with a confirmation message before upgrading a switch. If you
answer No, the management software does not display a confirmation
prompt before uploading the image file.
The management software begins the upload. The management
software notifies you when the upload is complete.
After receiving the file, a switch compares the version numbers of the
new and existing image files. If the new image file has the same or an
earlier version number as the file in the application block, it cancels the
update process. If the new image file has a newer version number, the
switch writes the file to the application block portion of flash memory
and then resets.
Caution
The switch does not forward network traffic while writing the image
to flash and during the reset process. This can take several minutes
to complete. Some network traffic may be lost.
This completes the procedure for uploading the AT-S63 image file from
a master switch to other switches in an enhanced stack.