I have the same question. I believe it is supports at least v2 but would like confirmation. 

  @BuddieMac 

same question for ax-1800 , i would like to use smb 3.0

  @BuddieMac Why is a TP-LINK support person not providing the answer to the question? What version of the file share protocol SMB does the tp-link support? This is when sharing files on your network when a file system is mounted on the USB port.

  @BuddieMac good question......? i can barely get an answer on here or response, and no luck on tp-link "official" reddit either.

use advanced search operators, chatgpt can help w that to find what you need. i tried to look at the code to find what i need via 'TP-Link GPL Code Center' but they dont have my hardware version...just v3 and v1 smh. id post a link for you but when i try to post relevent helpful info such as links and or code from a termianl or paste bin, this site throws an error, another reason this forum is not very good imo....i know for my linux machine and archer ax-1800 the usb function on my router was utilizing ports 137 and 138 which is no good, as well as 445. Again i would post links to those facts but unfortunately cannot. 

SMB 3.1.1 is newest version and the only port that "generally" needs to be open is TCP/445, unless your security model calls for it, the other ports shildnt be used.

TCP/445 is utilized for direct TCP/IP communications, allowing the protocol to handle file and printer sharing, as well as other inter-process communication over a network

UDP/137-138 are associated with older versions of SMB, specifically SMB over NetBIOS, which is less secure. These ports are generally not used or needed for modern SMB communications (like SMB 3.1.1) that operate directly over TCP/IP using port 445. It's advisable to avoid using these older protocols and ports for security reasons, as they are more vulnerable to attacks and are often not necessary for contemporary network setups.

Also consider if possible using UDP/443 (SMB over QUIC) as opposed to the legacy TCP/445 if possible

  @BuddieMac 

I can get what my AX55 AX3000 is running using PowerShell on Windows 11.

Using the Get-smbConnect commandlet.

Not too straight forward though.

First i had to link the router USB disk to my PC, doing NET USE X: \\tp-share\g and these were the commands I used to do that:

=======================

PS C:\> net view
Server Name            Remark

-------------------------------------------------------------------------------
\\HPBD2482             Samba 3.0.37
\\IRVXPS8940           Irv's XPS8940
\\TP-SHARE             samba server
The command completed successfully.

PS C:\> net use x: \\tp-share\g  <-- (knew my disk letter on the share, but a NEW VIEW \\tp-share would show that if you didn't know it as below does)

PS C:\> net view \\tp-share
Shared resources at \\tp-share

samba server

Share name  Type  Used as  Comment

-------------------------------------------------------------------------------
G           Disk  X:
The command completed successfully.

==========================

So now the PS command:

========================

PS C:\> Get-SmbConnection

ServerName ShareName UserName         Credential                           Dialect NumOpens
---------- --------- --------         ----------                           ------- --------
tp-share   g         IRVXPS8940\xxxxx MicrosoftAccount\xxxxxx@yyyyyyycom 2.0.2   1

=========================

I would assume, the newer WiFi 7 routers would have more recent versions?

Hope this helps?

It shows me that SMB 2.0.2 is being used, which I assume IS correct?

  @IrvSp Thanks for sharing this. 

Following in the hopes that tp-link gives an official response.

  @BuddieMac 

I have a WiFi 7 router I'm testing, but it does support higher SMB version.

PS X:\> get-smbconnection

ServerName ShareName UserName         Credential                           Dialect NumOpens
---------- --------- --------         ----------                           ------- --------
tp-share   g         IRVXPS8940\xxxx MicrosoftAccount\xxxx@xxxx-com 3.1.1   3

Sorry, but I can not disclose the Router make or model, but I'd assume at least some Wifi routers will support higher SMB versions.