Setting Mikrotik as a Switch

I’m trying to setup a Mikrotik RB751 as a switch.

Initially I have ethernet port 2 connected to the uplink LAN and configured inside a bridge toghether with wlan1 .

When configuring ehthernet interfaces 3 and 4 as slaves of interface 2 (modifying the master-port to ethernet 2), the ping stops responding.
Setting those interfaces back to NONE, enables the ping response once again.

The interface ethernet 2 has an IP assigned wich is the one that responds to the ping.

Which would be the correct way to configure the router as a standard switch?

Thanks

if you are bridging, you should set the master as the bridge not the eth2 port

also only the bridge should have an ip, none of the interfaces