Private VLANs (PVLAN) take the protected port concept further by enabling you to control which ports in the same VLAN can communicate with each other and which ports cannot. This is accomplished by grouping ports together in secondary VLANs that are members of a Private VLAN. Just like protected ports, when troubleshooting PVLANs, you are usually dealing with the following issues:
Traffic is flowing between two interfaces when it should not be.
Traffic is not flowing between two interfaces when it should be.
When dealing with PVLANs, ...