[ovs-discuss] userspace datapath FreeBSD functionality

Hassan Samii hassan_samii21 at yahoo.com
Fri Nov 20 11:01:24 UTC 2015

thanks, seems a bit clearer. 

    Il Venerdì 20 Novembre 2015 11:39, "Fischetti, Antonio" <antonio.fischetti at intel.com> ha scritto:

 Hi Samii,
Broadly speaking ‘in-band control’ means that the Control-Plane and Data-Plane share the same transmission ‘channel’.
A typical example can be Rs-232 with XON/XOFF control bytes, which are sent with data bytes over the same wire. 
Or SMTP where the Control messages like ‘HELO’,etc are sent into the same stream of Data messages (the mail body, for ex.).

The official docs describe this feature in ovs, just search “In-Band Control” chapter at

With in-band control there's no separate/dedicated connection for ovs to communicate with the Controller.

Hope that helps,

From: discuss [mailto:discuss-bounces at openvswitch.org] On Behalf Of Hassan Samii
Sent: Thursday, November 19, 2015 5:09 PM
To: Ben Pfaff
Cc: discuss at openvswitch.org
Subject: Re: [ovs-discuss] userspace datapath FreeBSD functionality

Its not clear what in-band control is, for me...

Il Giovedì 19 Novembre 2015 17:40, Ben Pfaff <blp at ovn.org> ha scritto:

On Thu, Nov 19, 2015 at 04:30:43PM +0000, Hassan Samii wrote:

> Im reading the official documentation of userspace datapath for FreeBSD and i dont really understand the following:
> Currently, on FreeBSD, the functionality required for in-band controlsupport is not implemented.  To avoid related errors, you can disablethe in-band support with the following command.      ovs-vsctl set bridge br0 other_config:disable-in-band=true
> Can someone break it down for me? whats a scenario where this happens?thanks

Are you using in-band control?  That's the situation.

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