Description

      In cluster mode, each controller node manages some switches, and for these switches the controller acts as the master role. Of course, other controller nodes for these switches is also not without meaning, they have been playing the role of slave. When the master controller shutdown or other reasons cause it can not work, those slave controllers will change the role become master. Under normal circumstances, they will master these switches equally.

      This test case will config multiple switches connected to a cluster controllers. By shutdown one of the controllers to measure how long it will take for the role intimation time of the cluster.

      During the role intimation, there will be lots of role_request packets, the results can be calculate by the time difference between the first role_request message and the last role_request message.

      The The number of nodes in the cluster and the number of switches are the variables of this test. The switches tested are with the sequence of 100、200、300、400 ... ...

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      10. Restart the test with another number of switches.

Test Results

      TBD

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• Three nodes

  Devices	First	Second	Thrid	Averages（S）
  100S	0.231	0.229	0.245	0.235
  200S	0.387	0.428	0.511	0.442
  300S	0.564	0.824	0.755	0.714
  400S	0.852	1.157	0.901	0.970
  500S	1.202	1.430	1.144	1.259
  600S	1.716	1.266	1.215	1.399

  Image Added

  As shown in the histogram, the result is linear with the number of switches. When the number of switches after more than 600, the sessions is not support good enough, session flap occurs.