On May 29, 2012, at 5:02 AM, Oliver Francke wrote:

> Hi Justin/Volkan,
> 
> On 05/24/2012 06:50 PM, Justin Pettit wrote:
>> On May 24, 2012, at 8:43 AM, Volkan YAZICI wrote:
>> 
>>> I always thought STP would have been enabled by default.
>> 
>> vswitches are typically deployed at the edge, so there isn't usually a need 
>> for STP in those deployments.  STP support is a relatively recent addition, 
>> and since OVS is usually run as a vswitch, we decided to leave it off by 
>> default.
> 
> well... that's not the worst decision. If I add/delete tap-interfaces for the 
> qemu-kvm processes, there is a connectivity-timeout on the whole machine, 
> which I now refer to an STP-relevant event.
> How can I make sure, that interface-up/down does _not_ influence the 
> ovs-stp-functionality, if at all possible?

What if you disable STP on those tap devices?  You can control this with the 
"other_config : stp-enable" key on the Port table.  I imagine you'll want to 
disable STP in the same atomic transaction.  You can do this by using the "--" 
separator in a single ovs-vsctl command to add the port and disable STP.

--Justin


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