On Thu, 20 Nov 2014 14:30:05 +0800
Yafeng Zhou <[email protected]> wrote:

> Hello,all:
> 
>   I am newer in SDN and Ryu, I am trying to discovery switches and links
> between switches, and I use the module ryu/topology/switches.py and
> ryu/topology/dumper.py just as the ryu-del mailing list described
> <http://sourceforge.net/p/ryu/mailman/ryu-devel/thread/[email protected]/>
> :
> 
> 1. Run mininet $ sudo mn --topo=tree,depth=2 --controller=remote
> 
> 2. Run ryu-manager with topology module and event dumper
> $ ./bin/ryu-manager --verbose --observe-links ryu/topology/switches.py
> ryu/topology/dumper.py
> 
> However, here I get an ERROR:
> 
> Import Error: "cannot import name cfg"

Looks like oslo.config python library cannot be imported. You
successfully installed Ryu?

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