Test steps

      1. Config IxNetwork with one switch switches (first with 100) with linear topology and two hosts . Set the packet_ in messages of the switch, the interval is 50ms, total 1000000 packets, using ICMP or ARP packetsfirst and last switch.

      2. Start the controller with the features install.

      3. Start the OF protocol of the switch.

      4. Wait until the channel is established and Echo message interaction started.

      5. Start the capture of IxNetwork.

      6. Enable packet_inthe traffic between this two hosts, wait until all of the packet_in messages are sent and  no packet_out messages receivethe hosts can ping through each other.

      7. Stop the capture, analyse the messages captured. First verify Write down the number of packet_out message N, N should be equal to 1 million, if N is less than 1 million, restart this test with smaller packet_in rate. Second, calculate the time difference between the time of the first packet_out in message T1 and the time of the last packet_out message T, the packet_out rate can be calculated by N/T. Third, calculate the time delay of each packet_in-packet_out pair as t1、t2、t3 ... ... , of course this can be caculate by decentralized way(select ten sets of pairs), at last calculate the latency by t1+t2+t3 ... ... /N.flow mod message T2. Caculate the time of Datapath seted up T=T2-T1

      8. Clean the configuration of controllers and IxNetwork.

      9. Repeat test step 1-9 8 for five three times.

      10. Restart the test with another packet_in ratenumber of switches.

Test Results