09-09-2018 02:32 AM - edited 03-08-2019 04:07 PM
cisco switch SG350-28 VLAN created all ports are in trunk mode but it automatically goes to trunk mode
09-09-2018 08:45 AM
Hello Tukaram,
This question is not clear at all. Can you explain better what you're trying to achieve and the results that you're getting?
Regards,
08-17-2019 03:48 AM
08-17-2019 10:08 AM
Hello Tukaram,
see the following thread
https://community.cisco.com/t5/switching/sg350-28-trunk-ports-not-holding-tagged-vlans/m-p/3822881
I have checked the command reference and this device should not support the DTP protocol that is used by Cisco IOS switches.
The DTP protocol mode desirable could make ports to negotiate and become trunks.
What is connected to the switch ports ?
Hope to help
Giuseppe
04-13-2021 04:25 AM
Hi
Smart port feature is enabled which caused it. You can search "SmartPort" in SG350 and Disable it.
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