Issue with access port switch to trunk port

[Aymeric_cz]

Hi !

We have 2 sg350-10 and 2 sg350-28.
Switch port move from access mode to trunk mode without any configuration of my hands on my computer, I think it’s really a problème.
If I turn off the switch and then on, without any copper connection, the start configuration is ok, but when I plug rj45 off my network some off access port switch to trunk port.
Do you know it?

Thanks in advance.

[Mark Malone]

Hi
is Auto Smart port feature enabled that could cause that , it van reconfigure ports automatically based on internal macros
you can disable it globally and retest

[Mark Malone]

Global Cli command
no macro auto smartport

or GUI section

Properties

Telephony OUI is currently disabled. Auto Smartport and Telephony OUI are mutually exclusive.

Administrative Auto Smartport: Disable Enable Enable by Auto Voice VLAN Operational Auto Smartport: Enabled

[Aymeric_cz]

Thanks but smart port is not between the Cisco devices ? 

The devices that cause issue, when port accès switch to trunk mode are not Cisco product but maybe, the Dante protocol by Audinate which is audio over ip, is known as the same ?