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To allow untagged traffic to access the router/switch, start by creating an IP address on the bridge interface.
It is required to add VLAN 1 to ports from which you want to allow the access to the router/switch, for example, to allow access from access ports ether3, ether4 add this entry to the VLAN table:
/interface bridge vlan
add bridge=bridge1 untagged=ether3,ether4 vlan-ids=1
Make sure that PVID on the bridge interface matches the PVID value on these ports:
/interface bridge set bridge1 pvid=1
/interface bridge port set ether3,ether4 pvid=1