This video completes the full OSPF multi-area configuration across the entire logical systems topology — configuring the final CE3 to PE3 link in area 3 and verifying end-to-end reachability across all five OSPF areas from a single logical system. It also shows the full scope of what 14 virtual routers running inside one vMX image can actually do.

The CE3 logical system is the final piece of the topology. Its configuration follows the same pattern as CE1 — a loopback address in the 33.33.33.0 range, a router ID to match, a logical tunnel interface to PE3 using the 172.16.3.0/24 subnet, and OSPF area 3 on both the loopback (passive) and the tunnel interface. PE3 is also updated with OSPF area 3 configured on its CE3-facing interface, making it an ABR between area 0 and area 3.

Once CE3 is committed and the OSPF adjacency with PE3 comes up, the show route output on CE3 shows the complete picture — loopbacks from all four PE routers, the core, and the other CE devices, all reachable via inter-area OSPF routes. The routing table confirms that all 14 virtual routers have full visibility of each other’s networks.

The connectivity test is the highlight of this video. Pinging from CE3 to 192.168.1.1 in area 1, then to 192.168.2.1 in area 2, and then to 192.168.4.1 in area 4 — all successful. Traffic is crossing multiple OSPF area boundaries, transiting through PE routers acting as ABRs, within a topology running entirely on a single vMX image with six CPU cores and eight gigabytes of RAM.

The video closes by putting the OSPF configuration in context — 14 virtual routers, five OSPF areas, full inter-area reachability, all running on hardware that fits comfortably on a home PC. The complete OSPF configuration file is available for download so you can import it directly and pick up from this point for the BGP and MPLS sections of the series without having to configure every device from scratch.