[pox-dev] Forwarding L2 Learning Example Behavior

[Murphy McCauley]

On Sep 11, 2012, at 12:54 AM, William Emmanuel Yu wrote:

> I am now running the webservices code from your fork. I was able to
> successfully run it as a hub using the example.
> 
> curl -i -X POST -d '{"method":"set_table","params":{"dpid":
> "00-00-00-00-00-01","flows":[{"actions":[{"type":"OFPAT_OUTPUT",
> "port":"OFPP_ALL"}],"match":{}}]}}' http://127.0.0.1:8000/OF/
> 
> However, for the other commands, I just get a blank.

This is by design.  According to the JSON-RPC spec, you have to include an "id" key if you want a response.  It's best if it's an integer.  If you don't care about it, just drop id:0 in there.  Try:
curl -i -X POST -d '{"method":"get_switches", "id":0}'

> On a note, do these refer to traffic
> that Packet_in to the controller right or do switches update these stats
> regularly? I presume the latter?

OpenFlow stats are kept by the switches.  I don't remember if there are guarantees on how often they're updated.  I think there might be.  Should be in the spec.  When the web service gets a request, it polls the switch before returning the response.

-- Murphy

> 
> On Fri, 2012-09-07 at 00:12 -0700, Murphy McCauley wrote:
>> On Sep 7, 2012, at 12:03 AM, William Emmanuel Yu wrote:
>> 
>>> I think I understand what you are saying. It does keep registered flows.
>>> Anyway, here is what I tested it on. Then I also did a version of hub
>>> that registered flow instead. Now when running iperf I can see the
>>> throughput difference between the hub and switch implementations. Hope
>>> its ok.
>> 
>> This version doesn't suffer from the problem I was referring to because it installs exact-match rules (or something close), not MAC-only rules.  It does this using ofp_match.from_packet().
>> 
>>> On monitoring, I found your fork and am going to take a look at the
>>> webservices bit. 
>> 
>> It may not be the best example, but at least it shows how to create the packet, I think.  It's openflow.webservice that I'm referring to.
>> 
>> -- Murphy
> 
> -- 
> -------------------------------------------------------
> William Emmanuel S. Yu, Ph.D. (杨怀义)
> Department of Information Systems and Computer Science
> Ateneo de Manila University
> email  :  wyu at ateneo dot edu
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