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[mininet-discuss] In-band Controller in Mininet
Gregory Gee
gee.developer at gmail.com
Mon Dec 30 12:13:36 PST 2013
I even just tried creating a netns called s1 and moving just the OVS
interfaces into it, not the full ovsdb/... , but then packets stopped
forwarding.
I'll have to play with it a bit more, but not sure if I will succeed.
Greg
On 30/12/2013 2:58 PM, Gregory Gee wrote:
>
> Yah, I'm still learning what can be done with the linux netns
> namespaces. I believe you are correct it that the correct workaround
> seems to be running multiple instances of ovsdb/ovs-vswitchd, each in
> it's own namespace. I'm not sure how well that could scale though.
>
> Greg
>
> On 30/12/2013 3:18 AM, Volkan YAZICI wrote:
>> Thanks for the reply Gregory. I read the thread you pointed and its
>> references as well, but they did not really help. It might be due to
>> my lack of information on the subject too. Further, I do not have a
>> clear perception about what "inNamespace" flag turns on and off. Are
>> we supposed spawn multiple ovsdb/ovs-vswitchd processes? Or can
>> in-band control plane be implemented via namespace tricks? Any helps
>> on the subject will be really appreciated.
>>
>>
>> On Mon, Dec 30, 2013 at 4:27 AM, Gregory Gee <gee.developer at gmail.com
>> <mailto:gee.developer at gmail.com>> wrote:
>>
>>
>> Hmm, interesting. I wonder if the packets are jumping from s1
>> to s2 through the root network namespace instead of using the
>> link? Looks like a topic Bob discussed a while back when I did
>> through the OVS mailing list. Looks like there is a workaround,
>> but I'm not sure how well it would scale if you want to test it
>> with large networks.
>>
>> https://mailman.stanford.edu/pipermail/mininet-discuss/2013-March/001827.html
>>
>> Would be interested to here now/if people solved this
>>
>> Greg
>>
>>
>> On 27/12/2013 7:36 PM, Ahmad Soltani wrote:
>>
>> on the subject of in-band controller in mininet,
>> Volkan, I checked it with wireshark, You're right.
>> I couldn't observe any OpenFlow activities anywhere on the
>> network except in the switch that was directly connected to
>> the controller (and specifically the interface that is
>> connected to the host which runs the controller)
>> The debug messages on the controller however clearly show
>> that the controller connects to all switches.
>> How could the controller connect to a switch without
>> handshaking (OFP echo req/rep)?
>>
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