Configure SG300 to work like an unmanaged switch

Hi!
How do i have to configure the SG300 so that it acts like any other completely unmanaged Switch. 
I dont want to configure any vlans on the sg300. It should just work like there wouldnt be a sg300, but an unmanaged switch.
The story behind:
I want to use a SG300-28P as POE-Switch for FortiAP-Access Points, but it doesnt work out of the box cause FortiAP receives and sends some tagged and untagged VLAN-traffic.
Everything works, if i use a cheaper, unmanaged POE-Switch, but i cant get it to work if i use a SG300.
Thanks for any help.
Tom

Thanks for your help. After disabling CDP and LLDP it started working.

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