This is an industrial switch from "Phoenix contact". All the settings regarding vlan is presented in this image: the switch configuration This switch doesn't have "Trunk" or "Edge" settings. I believe VLAN1 may be close to the concept of "native vlan"...? Interestingly, B is not learnt by the switch at all.
A and B talk to each other thru unknown unicast mac flooding in VLAN1 and VLAN3 networks. So a layer 2 switch is "routing" traffic between different vlans... looking for a plausible explanation on this. Thanks.
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