Native Vlan vs PVID

 In network configurations, the Native VLAN and Port VLAN ID (PVID) are related but distinct concepts, especially within the context of IEEE 802.1Q VLAN tagging. The Native VLAN is a specific VLAN used for untagged traffic on a trunk port, typically used for backward compatibility and management traffic. PVID, on the other hand, is the VLAN ID assigned to an access port or used to assign a VLAN to untagged frames entering a port. 
Here's a more detailed breakdown:
Native VLAN:

    Purpose:
    Primarily used on trunk ports (links between switches) to handle untagged traffic. 

Functionality:
When a switch receives an untagged frame on a trunk port, it automatically assigns it to the native VLAN. 
Default:
The default native VLAN is often VLAN 1, but it can be configured to another VLAN ID. 
Example:
If a switch port is configured as a trunk and the native VLAN is set to VLAN 10, any untagged frame received on that port will be treated as belonging to VLAN 10. 

PVID (Port VLAN ID):

    Purpose:
    Assigned to an access port (a port connected to a single VLAN) or used to assign a VLAN to untagged frames on any port (including trunk ports). 

Functionality:
When a device sends an untagged frame to a port with a configured PVID, the switch assigns the PVID's VLAN ID to that frame. 
Usage:
PVID is used to ensure that untagged traffic from devices like PCs or IP phones (which may not support VLAN tagging) is properly placed into the correct VLAN. 
Example:
If a PC is connected to a switch port with a PVID of 20, any untagged frames from the PC will be treated as belonging to VLAN 20. 

Key Differences Summarized:

    Scope:
    Native VLAN is specific to trunk ports, while PVID can be used on both access and trunk ports. 

Traffic Type:
Native VLAN handles untagged frames on trunks, while PVID handles untagged frames on any port. 
Purpose:
Native VLAN provides backward compatibility and handles management traffic, while PVID is used to assign VLANs to untagged traffic. 

In essence, the native VLAN is a specific type of PVID used on trunk ports to handle untagged traffic, while PVID is a more general concept used to assign VLANs to untagged frames on any port.