I agree there is a loop. I dont think that looping must be in the first place if I intended to use this switch as a L2 bridge. The ports that connected to other switches cause MAC table instability by bouncing MACs of my end stations between different ports. As I said, no STP/RSTP, all ports are access, no trunks configured just physical connections. As you noted I set static MACs and they are persistently configured on required ports. Still ping are intermittent or lost. Until I disconnect the ports linked to other switches. VLANs having no such issues at all.
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