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:
Comparison Table: VLAN vs Private VLAN
|Different Vlans must belong to different IP subnets.
|PVLANs belong to the same IP subnet
|Vlan works in Layer 2 and Layer 3
|PVLAN is method to segment device at layer 2
|Vlan is the basic requirement for all LAN
|PVLANs are required for specific requirements wherein endpoints of same VLAN should not communicate to each other. E.g. – Mainly in ISP scenarios to prevent different customer from communicating to each other on same LAN segment.
|Intervlan communication is performed at L3 SVI level
|PVLAN to outside communication is performed via Primary VLAN.
Download the difference table: VLAN vs Private VLAN.
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