How to setup switch connected to routers?

Question

Computer networks

In screenshot 2, networks are routing packets through OSPF, but routers 2.3, 3, 3.1, and 3.2 are connected in switch0. How can I configure this switch so that BGP (R2.3, R3, R3.1, R3.2) works for me?
#on switch1 vlan 5, 6. I can fix border routers (2.3 and 3) of another model and land vlans on interfaces, if necessary.

Answer 1

1. All ports on the switch that go to the routers are thrown into one vlan. port access and configure bgp.
2. Configure all ports on the switch that go to the routers as a trunk, for each pair you create a vlan on the switch, and on the routers a subinterface