dpctl: Error connecting to switch unix:/tmp/s1. (No such file or directory)

[RdL87]

Hi all,
I use mininet to make the experiment and I want to add the queue to the port of the switch which is the ofsoftswitch13. When I use "sudo dpctl unix:/tmp/s1 queue-mod 1 1 80" to add the queue, there is a error.

RECEIVED (xid=0xF0FF00F0):
error{type="QUEUE_OP_FAILED", code="EPERM", dlen="56"}
I find a answer(http://stackoverflow.com/questions/33677006/adding-queues-to-switch-of-ofsoftswitch13-implementation-doesnt-work?answertab=active#tab-top) for this problem. Because of mininet set the user switch "--no-slicing", failing to add the queue. Then I follow the answer to modify the mininet, but it doesn't work and the switch can't negotiate with floodlight controller.

May 14 06:36:10|00001|vconn_unix|ERR|/tmp/vconn-unix.23705.0: connection to /tmp/s1 failed: No such file or directory
dpctl: Error connecting to switch unix:/tmp/s1. (No such file or directory)
I don't know how solve it, please help me?

[lantz]

1. Like many low-quality answers on stackoverflow.com, the referenced "solution" is bogus for multiple reasons, not the least of which is that you don't need to change Mininet to set options - - please read the documentation! :(
2. I think your dpctl command is also wrong.
3. This doesn't seem to be an error in Mininet, so it probably belongs on the mailing list instead.