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[mininet-discuss] More than 256 ovs switches

Brian O'Connor bocon at
Tue Dec 3 19:04:32 PST 2013

Hi Gary,

The limit appears to be related to the file descriptor limit.

When you invoke "mn" from the command line, we run util.fixLimits to
increase the number of allowed file descriptors.

If you are running a custom Python script, you can try:

from mininet.util import fixLimits

- Brian

On Thu, Nov 28, 2013 at 7:19 AM, Gary Brown <uvugdbrown at> wrote:

> I am trying to recreate an actual network topology experiment I did this
> past summer that requires 288 vSwitches, but when I use Mininet to create
> the network, I get an exception at about 256 switches (highly suspicious)
> and Mininet cleans everything up and quits.
> I have seen posts on this mailing list indicating people are creating
> experiments with more than 256 switches, up to 1024 and even 1200.  My
> online searching has indicated ovs switches have a limit of 256 switches
> (see Limits at bottom of webpage at
> Has anyone been able to create more than 256 ovs switches and if so, how
> did you do so, or at least how did you raise the limit?
> I am using the standard Mininet 2.1.0 VM running Ubuntu 13.04 inside
> VirtualBox 4.2.18 r88780 on a Windows 7 laptop with Core i7 (Ivy Bridge)
> and 32 GB of memory.
> --
> Gary
> M.S. student, University of Utah
> _______________________________________________
> mininet-discuss mailing list
> mininet-discuss at
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