The sub-directories here correspond to the three switch modes of iSDX:
test-mt- are examples using the multi-table configuration. These can be used on switches that support multiple tables, such as Open vSwitch which is used by Mininet.test-ms- are examples using the multi-switch configuration. When switches don't support multiple tables, the effect of multiple tables can be achieved by using multiple switches.test-os- are examples using the one-switch-with-loopbacks configuration. This is like the multi-switch configuration, but rather than using multiple switches, it uses a single switch with some of the output ports looped back to input ports so that packets can make multiple passes through the same switch.