On Apr 17, 2013, at 3:50 PM, Mayumi Park Campos wrote: > I have a problem with the conection between the pox controller and > openvswitch.
Are you sure you have a problem? > And on the controller this is what I see: > WARNING:forwarding.l2_learning:Same port for packet from 00:0c:ce:1f:10:1d -> > 00:0c:ce:1f:10:1d on 00-14-22-4b-5e-60.2. Drop. > DEBUG:forwarding.l2_learning:86474710624: flood 00:0c:ce:1f:10:1d -> > 01:00:0c:cc:cc:cc > DEBUG:forwarding.l2_learning:86474710624: flood 00:0c:ce:1f:10:1d -> > 01:00:0c:00:00:00 > WARNING:forwarding.l2_learning:Same port for packet from 00:0c:ce:1f:10:1d -> > 00:0c:ce:1f:10:1d on 00-14-22-4b-5e-60.2. Drop. > > But I don´t understand why I get that message. > > Could anyone help me to understad l2_learning will not try to forward packets out of the same port that they arrived from. This is because if the packet was received from that segment, then if the recipient was also on that segment, it will have also received it -- there's no point sending it back out. That's the case that this WARNING message refers to. Usually it's caused by being plugged into a hub or a real Ethernet switch which hasn't learned a destination yet. This case is a bit weird, though. It looks like you have some strange packets where the destination address is the same as the sending address. It looks like they're coming from the br0 interface; you might try looking for them with Wireshark. In this case, of course it looks like the recipient is out the same port it was received on -- the recipient seems to have been the sender! Dropping these packets is the right thing to do despite the warning in the log. -- Murphy
