Yes, they pass through the same switches. This is a sample of a polling and as you can see the traffic is different from each other. The switch S1 should have the amount of traffic passed through it equal or bigger than S2, S3 , S4 or S5, since it is the first switch. Maybe the problem is due to the delay of sending a statistic request and wait for a statistic reply since the ovs switches are update once a second, if I'm right. The traffic below is in Mbps and the delay of each link is 25ms. This is the total traffic passed through a switch on a specific flow and collected on a specific time (each second). Time S1 S2 S3 S4 S5
10:57:2:537;640.98;945.17;1010.35;32.59;32.59 10:57:3:672;1694.78;2009.84;2053.3;2096.75;2151.07 10:57:4:805;2183.66;2498.72;2520.45;2553.04;2574.77 10:57:5:932;2585.63;2889.82;2922.42;2955.01;2998.46 10:57:7:61;2900.69;3215.74;3226.61;3248.34;3270.06 10:57:8:198;3378.7;3693.76;3758.94;3845.86;3932.77 10:57:9:327;4465.1;4769.3;4834.48;4910.53;5008.3 2014-06-25 13:22 GMT-03:00 Ben Pfaff <b...@nicira.com>: > On Wed, Jun 25, 2014 at 01:12:33PM -0300, Pedro Henrique wrote: > > I'm using an openflow controller to poll the ovs each second, from this > I'm > > getting the flows passing through the switch ans other relevant > information. > > > > I made a topology similiar to this. > > > > Host1 --- OVS1 ---- OVS2 ---- OVS3 ---- OVS4 --- OVS5 --- Host2 > > > > I'm generating traffic from Host1 to Host 2 using iperf and all hosts and > > switches are generated by Mininet. > > > > I'm polling all the switches on the same time and I noticed that OVS1 > > doesn't have more traffic passing through it than the OVS5 or any other > > switches. This seems strange, since I'm polling the switch from the > > beginning of the flow, so the traffic from OVS1 should be bigger than > OVS2 > > and OVS2 traffic > OVS3 traffic > OVS4 traffic > OVS5 traffic. But this > > doesn't happen. > > I don't understand why there should be more traffic on OVS1 than other > switches. All of the traffic from Host1 to Host2 passes through all > of the switches, right? So I'd expect each switch to report the same > amount of traffic. >
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