How to create my own topo

[newborn22]

Hi!
For further study, I have to create my own topo.
First I want to create a simple demo just looks like this:

So, I append some codes to the topo-v6.py

and netcfg.json

The result is that the mininet links cmd returns correctly,

but the topo showed by onos is wrong!

I've been stuck here for a long time and don't know what to do.
Hope to get your answers and help！！
Thank you very much!

[newborn22]

And now I find that although the topology on the Mininet does not match the onoe on the ONOS, as long as the flow table is delivered according to the topology on the onos, the network can be connected.

[yogiex]

i want to ask about this custom topo in mininet as expected but in onos ui is different from mininet, how to create custom? is related with netcfg configuration?