[pox-dev] l2_learning_tutorial flow rules (strange behavior?)

[Tmusic]

Thanks for the quick response!
l2_pairs is indeed a great example!
I had to change the code for flooding the packet in order to get it working
in the stable branch (with buffers as in l2_learning_tutorial). Is this the
right way to do it?


2012/10/1 Murphy McCauley <murphy.mccauley at gmail.com>

> Yes, that's always going to happen with l2_learning_tutorial.  This is, in
> fact, an example of how NOT to try to write a learning switch, but without
> proper context.  I deleted it in development fork/branch a while back, but
> looks like I never did on the master branch.  I have done so now.
>
> The problem you're seeing here was actually just discussed on this list a
> few days ago.  The issue is that the "learned" rules result in hiding other
> packets from the controller, so it never learns all the destinations.
>
> If you want a good example of a switch for a tutorial, look at
> forwarding.l2_pairs or samples.of_tutorial.  l2_pairs gets around the issue
> of hiding other sources by only installing rules for each PAIR of learned
> addresses.  These may only be available in the betta (development) branch.
>
> -- Murphy
>
> On Oct 1, 2012, at 11:38 AM, Tmusic wrote:
>
> > Hi,
> >
> > I'm trying to learn how to establish flow rules by studying
> l2_learning_tutorial, but I'm experiencing rather strange behavior.
> >
> > On a VM with mininet (one switch, three hosts) and POX installed I first
> start up mininet and then the l2_learning_tutorial (the behavior is easier
> to see this way).
> > I added one line after the flow installing to see what happens:
> print 'added route to', packet.src,'(packet destined to',packet.dst,')'
> >
> > When I perform pingall in mininet (one or more), the same routes are
> added over and over again (see print statement above).
> > Dpctl shows that only two entries are being added (I expected three):
> >
> >   cookie=0, duration_sec=268s, duration_nsec=529000000s, table_id=0,
> priority=32768, n_packets=16, n_bytes=1344, idle_timeout=0,hard_timeout=0,
> > dl_dst=00:00:00:00:00:02,actions=output:1
> >   cookie=0, duration_sec=268s, duration_nsec=463000000s, table_id=0,
> priority=32768, n_packets=11, n_bytes=910,
> idle_timeout=0,hard_timeout=0,dl_dst=00:00:00:00:00:03,actions=output:2
> >
> > The packets seem to keep going to the controller.
> >
> > Any ideas?
> >
> > Thank you in advance!
> >
> > Tim
> >
> >
> >
> >
> >
> >
>
>
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