What is PVLAN?

Answer 1

A PVLAN on a network is a broadcast domain. All of the hosts on that VLAN can communicate with the other members of the same VLAN. PVLANs allow traffic to be segmented at the data-link layer (layer 2) of the OSI model, limiting the size of the broadcast domain.

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Answer

A private VLAN contains switch ports that cannot communicate with each other but can access another network. These ports are called private ports. Each private VLAN contains one or more private ports, and a single uplink port or uplink aggregation group.

A typical application is at a hotel where each room has a port that can access the internet. In this situation it is undesirable to allow communication between rooms. Another application is to simplify IP address assignment. Ports can be isolated from each other while belonging to the same subnet.

The network device forwards all traffic received on a private port out the associated VLAN's uplink port, regardless of VLAN ID or MAC destination address. Packets received on an uplink port are forwarded in the normal way (i.e. as for non-private VLANs) for all types of packets. Note that while private VLANs provide isolation at layer 2, layer 3 communication may still be possible