TS-653d and Port Trunking w/ Unifi SDM

English Networking
1

I set up port trunking on the NAS (802.3ad in layer 2+3 (MAX+IP) mode), and link aggregation on unifi, and unifi sees the NAS, I can get into the GUI by its IP address from my browser with no issue, but the samba share on windows seems to have disappeared. Any ideas here? Screenshots below.

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and on unifi:

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2

Actually, restarting the NAS fixed this - sorry, but leaving this thread in case it happens to others with such an easy fix =).

If anyone is still reading, does anyone enable port trunking AND SMB Multichannel? Is that advised againast? Anything bad could come of it or enabling both is always better?

3

I have used it. Works fine. The only thing is SMB Multichannel is really designed to work over multiple network connections. A trunked connection is really seen as one by the NAS and the switch so I don’t know if Multichannel buys anything…

4

Port Trunking and SMB Multichannel are designed for different purposes. While they can be enabled at the same time, they may not deliver the expected performance benefits. In some network environments, enabling both may even lead to unstable connections.

Port Trunking (e.g., 802.3ad/LACP) combines multiple physical network cables into a single logical link and presents only one IP address to the outside. However, SMB Multichannel relies on multiple distinct IP addresses to establish multiple channels. As a result, when Port Trunking is enabled, SMB only detects a single path and cannot initiate multiple TCP connections, thus losing the advantages of multichannel transmission.

We recommend choosing the appropriate method based on your actual usage scenario:

  • For environments with multiple users accessing the NAS simultaneously or businesses with a network switch setup, Port Trunking is recommended to improve overall performance and stability.
  • For individual users or small offices focused on improving file transfer speed between a single client and the NAS, SMB Multichannel is the better choice to shorten transfer time and fully utilize available bandwidth.

Hope this helps clarify the difference!