Add switches and links using Mininet CLI

[t2ance]

When I added a new switch or link using mininet CLI (e.g. "py net.addSwitch('xxx')"), the topology in the terminal was modified. However, the controller didn't get the modification and events like "EventSwitchEnter" were not triggered. How can the controller know the topology was modified?

[t2ance]

I figured out that we need switch xxx start to trigger EventSwitchEnter event. But after adding some new links, even use link x y up still cannot trigger EventLinkAdd. How to solve it?

[EricLee543]

link x y up can make an effect on the existing link. If you want add a not existing link, please useaddLink function in Python script.