[ovs-discuss] Connecting OpenVswitch and a NOX controller present on the same machine

Anisha Kolasani akolasan at cse.unl.edu
Fri May 4 00:39:41 UTC 2012


Some lines from the OVS log file are showing:

*OVS log file:*

May 03 16:40:45|231992|rconn|DBG|br0<->tcp:127.0.0.1:6633: entering BACKOFF
May 03 16:40:53|232147|rconn|WARN|br0<->tcp:127.0.0.1:6633: connection
failed (Connection refused)

 May 03 18:46:41|00109|rconn|INFO|br0<->tcp:127.0.0.1:6633: waiting 1
seconds before reconnect

May 03 18:46:41|00110|rconn|DBG|br0<->tcp:127.0.0.1:6633: entering BACKOFF

May 03 18:46:41|00111|connmgr|WARN|br0: unsupported controller
"--out-of-band"


 When I saw the *tcpdump on lo*, there were requests passing with the
controller:


localhost.50703 > localhost.6633: Flags [S], cksum 0xfe30 (incorrect ->
0x302d), seq 266318493, win 32792, options [mss 16396,sackOK,TS val 4046000
ecr 0,nop,wscale 4], length 0
17:35:04.516841 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto TCP
(6), length 40)
    localhost.6633 > localhost.50703: Flags [R.], cksum 0x0f58 (correct),
seq 0, ack 266318494, win 0, length 0
17:35:12.518817 IP (tos 0x0, ttl 64, id 53647, offset 0, flags [DF], proto
TCP (6), length 60)



How can the OVS be configured in --out-of-band control mode? Are there any
documents I could refer too..?

I tried using 'ovs-openflowd' to set controller to the swithch.. but there
was not command like that. Any pointers regarding this?


Thank you,

Anisha.



On Thu, May 3, 2012 at 4:51 PM, Ben Pfaff <blp at nicira.com> wrote:

> On Thu, May 03, 2012 at 04:44:56PM -0500, Anisha Kolasani wrote:
> > My system settings are:
> >
> > *sudo ovs-vsctl show*
> > 12681540-b7fe-4f22-8c25-8371ae195eb5
> >     Bridge "br0"
> >         Controller "tcp:127.0.0.1:6633"
> >         fail_mode: standalone
> >         Port "eth0"
> >             Interface "eth0"
> >         Port "br0"
> >             Interface "br0"
> >                 type: internal
> >         Port "tap0"
> >             Interface "tap0"
> >         Port "tap1"
> >             Interface "tap1"
> >
> >
> > There are no flows that I can see..
> > *sudo ovs-ofctl dump-flows br0*
> > NXST_FLOW reply (xid=0x4):
> >
> >
> > I am running the controller at the port 6633 in the same machine...But,
> the
> > following two are the only two message I see when the controller starts:
> >
> > *sudo ./nox_core -v -i ptcp:6633 pyswitch*
> > 00001|nox|INFO:Starting nox_core
> > (/home/anisha/nox/build/src/.libs/lt-nox_core)
> > 00002|nox|INFO:nox bootstrap complete
> >
> > I am not sure why the bridge br0 is not able to connect to the Nox
> > controller.
> > If anybody has tried this before, could you please let me know any
> pointers
> > to as to where its going wrong?
>
> You should probably configure OVS for out-of-band control.
>
> But what's in the OVS log?
>
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