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The logs should provide also the reason for the failure you are reporting.
If you're using rootwrap, one thing I'd very is that ovs-vsctl is in
your filter list.
You should have something like the following:

ovs-vsctl: CommandFilter, /bin/ovs-vsctl, root
ovs-vsctl_usr: CommandFilter, /usr/bin/ovs-vsctl, root
ovs-vsctl_sbin: CommandFilter, /sbin/ovs-vsctl, root
ovs-vsctl_sbin_usr: CommandFilter, /usr/sbin/ovs-vsctl, root

in  /etc/quantum/rootwrap.d/openvswitch-plugin.filters (actual
location might vary).

Also, executing the command on the shell and reading the output might
help (this command does not alter the state of OVS configuration, so
it's fine).

Salvatore

On 14 March 2013 09:24, Aru s <arumon82 at gmail.com> wrote:
> Hi,
>
> I am getting the below error while starting the quantum agent. Please help.
>
> ERROR:quantum.agent.linux.ovs_lib:Unable to execute ['ovs-vsctl',
> '--timeout=2', 'list-ports', 'br-int']
>
>
> Regards,
> Arumon
>
>
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