In this use case, 100k flows are programmed into a simulated network (mininet) with 15 nodes. Then, mininet is closed down and started again. This should result in all 100k flows programmed into the network. However, sometimes (not always) one tow switches do not have any flows programmed in them at all. This issue is also seen in the He plugin.

To reproduce, use the following steps:

1. Start mininet using the following command:

"sudo mn --controller=remote,ip=192.168.162.1:6633 --topo tree,4 --switch ovsk,protocols=OpenFlow13"

Let mininet connect to the controller

2. From another shell, use the flow_config_blaster script (located in the integration test project under 'test/tools/odl-mdsal-clustering-tests/clustering-performance-test') to program 100k flows into the controller:

./flow_config_blaster.py --threads 8 --flows 12500 --auth --no-delete --fpr 200

3. In the mininet test VM, use a script to make sure that all 100k flows have been programmed into the network:

/bin/get-total-found.sh

(or something similar); make sure all 100k flows have been injected into mininet. You may also check the controller's REST API, but collecting all the 100k flows takes a long time (> 10 minutes).

4. Stop mininet

5. Start mininet again:

"sudo mn --controller=remote,ip=192.168.162.1:6633 --topo tree,4 --switch ovsk,protocols=OpenFlow13"

6. In the mininet test VM, use a script to check whether all flows have been programmed from the switches:

/bin/get-total-found.sh

The sum of all flow counts on all switches should now be 100k. However, sometimes one or two switches do not have any flows. This does not happen always, so multiple retries may be needed to reproduce the problem.