VLAN VS PRIVATE VLAN

VLANS –

A VLAN is a group of switch ports administratively configured to share the same broadcast domain.

Private VLANs

Private VLANs (PVLANs) are used mainly by service providers. The main purpose of Private VLAN (PVLAN) is to provide the ability to isolate hosts at Layer 2 instead of Layer 3.By using PVLAN we are splitting that domain into some smaller broadcast domains. In other words we may summarize Private Vlan as “Vlans in Vlan“.

Below tables enlists the difference between both –

S No

Vlan

Private Vlan

1

Different Vlans must belong to different IP subnets. PVlans belong to the same IP subnet

2

Vlan works in Layer 2 and Layer 3 PVlan is method to segment device at layer 2

3

Vlan is the basic requirement for all LANEnvironments. PVlans are required for specific requirements   wherein endpoints of same Vlan should not communicate to each other.Eg –   Mainly in ISP scenarios to prevent different customer from communicating to   each other on same LAN segment.

4

Intervlan communication is performed at L3 SVI level PVlan to outside communication is performed via Primary   Vlan.
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