[pox-dev] working with multiple switches

[durga]

While, I am reading docs to work on vlans , I was as well experimenting on
using multiple switches.Without creating any complex topology, i stuck to
linear topology by running the below in mininet

sudo mn --topo linear ,4 --mac --switch ovsk --controller remote

which creates 5 links(h1<-->s1, h2<-->s2,s1<-->c0,s2<-->c0,s1<-->s2)
When I run the sample l2_learning switch module, h1 pings h2 successfully.
But how does the code differentiate between 2 ports if host 1 is connected
to port 1 of sw1( thus event.port ==1) and h2 is connected to port1 of
sw2(port == 1), then port == event.port condition might fail right? (though
it doesnot).

 else:
        port = self.macToPort[packet.dst]
        if port == event.port: # 5
          # 5a
          log.warning("Same port for packet from %s -> %s on %s.%s.  Drop."
              % (packet.src, packet.dst, dpid_to_str(event.dpid), port))
          drop(10)
          return
        # 6


the program I wrote, is failing at this very condition.

Cheers!
Durga
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