Here comes a brief guide on how to implement and use IP SLA.
Port protection is similar to private vlan, but much simpler. It is easier to configure “switchport protected” but it is only protected locally on the switch.
A protected port cannot communicate with any other protected port, but out all other ports on the switch. Therefore a protected port on SwA can communicate with a protected port on SwB, but neither can commnicate with any protected port on the same switch.
Simple as that. A private-vlan-light.