How to test snaketest?

I want to do a snake test.

In my recognition, I made the following settings, but I could not do that.
Please tell me the setting example.

What is SnakeTest? http://thenetworksherpa.com/wp-content/uploads/2013/02/SnakeTest1.png
vlan-setting.png

My guess is that you have to set VLAN mode to either enabled or strict.

Diagram: testcase.jpg

I configured the Diagram and the attached image, but I can not communicate with PC1 - PC2.
We confirmed that it can communicate on the same VLAN.
Other settings are Default.

Is the setting insufficient?
VLAN-setting-1.png
VLAN-setting-2.png
testcase.jpg