private vlan types:
primary - Carries traffic from promiscuous ports.
promiscuous port can communicate with all ports of the
same PVLAN, including the isolated and community
ports of the same PVLAN.
isolated - Carries traffic from isolated ports.
isolated ports can communicate only with the
promiscuous ports of the same PVLAN.
community - Carries traffic from community ports.
community ports of the same community can communicate
among themselves and with the promiscuous ports of the
same PVLAN.