I’m creating an experimental lab setup with topology:  Client ——— S1 ——— S2 ——— 
S3 ——— Server.   S1, S2, S3 are OVS switches and are in different subnets, and 
all nodes are Vms. I need to connect the nodes using GRE tunnels and so I need 
to use ports on OVS to do so.

Is there anything that can be done? Worst case scenario I have to reinstall 
ubuntu on each VM and start from fresh.

Thanks,
Nishanth 
> On 14-Oct-2015, at 11:51 pm, Gurucharan Shetty <shet...@nicira.com> wrote:
> 
> What is that you want to do at a high level? i.e. what is your goal?
> 
> On Wed, Oct 14, 2015 at 6:46 AM, Nishanth Devarajan <dev_ra...@yahoo.com> 
> wrote:
>> I tried, I don’t know why but it doesn’t work. I even tried removing OVS 
>> entirely and reinstalling it again. Even then it gives the same error. 
>> However when I run mininet , the topology works fine without any error from 
>> OVS or anything else. How does that even work?
>> 
>> Thanks,
>> Nishanth
>>> On 13-Oct-2015, at 11:35 pm, Gurucharan Shetty <shet...@nicira.com> wrote:
>>> 
>>> Where ever you did a 'make install', do a 'make uninstall'. The end
>>> result should be that 'find /usr -name ovs-vswitchd' should only say
>>> /usr/sbin/ovs-vswitchd.
>>> 
>>> Then:
>>> ps -ef | grep ovs
>>> 
>>> Kill both ovs-vswitchd and ovsdb-server processes using 'kill'.
>>> 
>>> 
>>> Then do '/etc/init.d/openvswitch start'
>>> 
>>> On Tue, Oct 13, 2015 at 10:17 AM, Nishanth Devarajan
>>> <dev_ra...@yahoo.com> wrote:
>>>> No I don’t know what Im doing very well. How exactly do I uninstall one of 
>>>> them completely so that I don’t get this problem? Also thanks :)
>>>>> On 13-Oct-2015, at 9:55 pm, Gurucharan Shetty <shet...@nicira.com> wrote:
>>>>> 
>>>>> On Tue, Oct 13, 2015 at 9:01 AM, Nishanth Devarajan <dev_ra...@yahoo.com> 
>>>>> wrote:
>>>>>> It says;
>>>>>> /usr/sbin/ovs-vswitchd
>>>>>> /usr/local/sbin/ovs-vswitchd
>>>>> 
>>>>> The error message in your log file says that there was already a
>>>>> ovs-vswitchd running. It is likely that since you have 2 ovs-vswitchd
>>>>> installed in your system, one of them has already been started with a
>>>>> startup script. So when you start the other one, it complained saying
>>>>> that another one has already been started.
>>>>> 
>>>>> You having 2 ovs-vswitchd in /usr/sbin/ and /usr/local/sbin/ also
>>>>> tells me that you likely installed one using 'make install' and the
>>>>> other using rpm or ubuntu packages. I strongly suggest to uninstall
>>>>> one of them (unless you know very well what you are doing)
>>>> 
>> 

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