[pox-dev] how to specify wildcards in ofp_match.from_packet()?

[William Emmanuel Yu]

Hi Murphy,

Thanks for the file again. Here is my tutorial file that I am going to
use to demonstrate various types of hub/switch implementations. 

https://github.com/hip2b2/poxstuff/blob/master/of_sw_tutorial.py

I implemented both a BAD SWITCH (that only does destination MAC mapping)
and a PAIR-WISE SWITCH (that does both source and destination MAC
mapping). Mysteriously, both switches work identically. 

You implementation below I called IDEAL PAIR-WISE SWITCH which
definitely saves time as it adds both flows in one go.

Also in my pox repo the following:

    msg = of.ofp_packet_out(resend = event.ofp)
    msg.actions.append(of.ofp_action_output(port = of.OFPP_ALL))
    msg.send(event.connection)

does not seem to work as my of.ofp_packet_out() does not support the
resend attribute. The msg object does not have a send() function. So I
re-wrote it again what I knew already worked which is in my
bcast_packet() function.

Thank you!

PS. For those who are wondering. This code isn't meant for production
use but for instructional purposes. 

On Mon, 2012-09-24 at 05:41 -0700, Murphy McCauley wrote:
> Check l2_pairs in the betta branch for a rough example, BTW.
> 
> -- Murphy 
> 
> On Sep 24, 2012 5:39 AM, "William Emmanuel S. Yu" <wyu at ateneo.edu>
> wrote:
>         Its a bummer but it will have to do. Thanks.
>         ------Original Message------
>         From: Murphy McCauley
>         To: aaa-William Yu
>         Cc: pox-dev at lists.noxrepo.org
>         Subject: Re: [pox-dev] how to specify wildcards in
>         ofp_match.from_packet()?
>         Sent: Sep 24, 2012 8:29 PM
>         
>         On Sep 24, 2012, at 5:13 AM, William Emmanuel S. Yu wrote:
>         
>         > Oh my. Definitely a great point I missed out.  So does this
>         mean there is no solution that allow us to a good
>         destination-only flow rule at L2? So source awareness is
>         mandatory to ensure "learning".
>         
>         I wouldn't bet my house on it, but I think that is true if you
>         are working within the OpenFlow 1.0 specification.
>         (Note that this also means you have on the order of
>         hosts-squared rules if you're doing learning in 1.0.)
>         
>         -- Murphy
>         
>         "Sent on the move."

-- 
-------------------------------------------------------
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
blog   :  http://hip2b2.yutivo.org/
web    :  http://CNG.ateneo.edu/cng/wyu/
phone  :  +63(2)4266001 loc. 4186
GPG    :  http://CNG.ateneo.net/cng/wyu/wyy.pgp

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