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How do I stop that loop at ovs? Any guideline if I am having issue then someone else must having same issue. 

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> On Sep 20, 2016, at 8:02 AM, CARVER, PAUL <pc2929 at att.com> wrote:
> 
> It may vary by IOS version and I don't have a 2960 around to check, but something like "show interface status err-disabled" should show you more detail as to the reason for the status.
> 
> At a guess, I'd say there's probably nothing wrong with your switch config. More likely you're causing a loop in the OvS or Linux Bridge on your compute node.
> 
> -- 
> Paul Carver
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> 
> -----Original Message-----
> From: Satish Patel [mailto:satish.txt at gmail.com] 
> Sent: Tuesday, September 20, 2016 07:06
> To: openstack <openstack at lists.openstack.org>
> Subject: Re: [Openstack] cisco trunk interface in err-disabled
> 
> Any help?  does anyone running openstack with cisco switch trunk?
> 
>> On Mon, Sep 19, 2016 at 5:06 PM, Satish Patel <satish.txt at gmail.com> wrote:
>> We have openstack mikata running and its trunk with cisco 2960 switch
>> and following configuration i have on switch side
>> 
>> 
>> !
>> interface GigabitEthernet1/0/1
>> description compute-1
>> switchport trunk allowed vlan 10,20
>> switchport mode trunk
>> spanning-tree guard root
>> end
>> 
>> 
>> why cisco trunk interface putting it into err-disabled mode? everytime
>> we have to reset interface to fix it. am i missing any configuration
>> here?
> 
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