Every container, VM and lab you run, in one window.

services:
  r1:
    image: frrouting/frr:8.4.4
    x-interfaces:
      - {rede: lan-a, ip: 10.0.1.1/24}
      - {link: r1-r2, ip: 10.0.12.1/30}
  r2:
    image: frrouting/frr:8.4.4
    x-interfaces:
      - {link: r1-r2, ip: 10.0.12.2/30}

x-vms:
  pc1:
    image: vpcs
    interfaces: [lan-a]
  R3:
    image: cisco-c7200   # or cisco-iol
    interfaces: [r1-r3, r2-r3]

• Drag a port to another to wire a cable; right-click a device for its console.
• Save the state of every device and go back to it, like a save point in an exercise.
• Imports keep the same devices, cards, cables and configs, mistakes included. What had to change is written down.