Topology abnormal when use RYU

[westwind]

The topology displayed abnormal when use RYU controller.
Topology file is following: https://gist.github.com/westwind/b18c626d8f9b6544d64b
Sometimes run the command 'mn --topo=tree --controller=remote' can got the same issue too.

[charlesmcchan]

Not able to reproduce the problem.
Please provide the result of
http://localhost:5567/info/topology
when the problem occurs again.

[westwind]

I find the reason of this issue,
because LLDP packet also will be flooded by simple_switch.