Segregated OSPF Networks, cross same physical path, how to segregate back out at other end?

Question

I'm sorry for being basic in writing this question. I think the details have been covered though.

What's happening here is, two separate networks are being brought into an isolated area over a microwave radio connection. I may need to move the Layer 3 for these isolated devices to be on their side of the microwave connection (the far side).

How will I have a single Layer 3 switch on the far side of the microwave connection, be able to participate in OSPF areas for both segregated networks, and not break anything. The networks are merged at the Layer 2 switches that connect to the microwave at both ends. I use trunks and VLANs to re-separate the traffic here, but am lost about what to do with Layer 3/OSPF.

NET A  (10.142.x.x)                                                    NET A               
OSPF AREA 7                                                            OSPF AREA 7
                       L2 SWITCH (to) MICROWAVE RADIO (to) L2 SWITCH 
NET B  (10.143.x.x)                                                    NET B
OSPF AREA 107                                                          OSPF AREA 107

Answer 1

Just remember that OSPF areas are assigned by interface, and OSPF areas, like 7 and 107 that you show, cannot directly exchange routes. The separate VLANs will use separate SVI interfaces, and each interface can be in a different OSPF area. You could have the layer-3 switch be in both areas without any problem.

You can also have separate OSPF processes if you want, but that seems unnecessary since you have different area numbers. Separate OSPF processes will allow you to have the same area number without mixing the two separate areas.