While configuring switching environments, network engineers get confused with significance of Default VLAN and Native VLAN while using Dot1Q encapsulation over trunk links. Though widely used terms, still both Default VLAN and Native VLAN are terms which tend to create doubt.
A quick run through Default VLAN and Native VLAN –
Both the terms are related to 802.1q. The 802.1q standard defines a method of tagging traffic between switches to distinguish which traffic belongs to which VLANs.
Default VLAN is VLAN 1 which cannot be shut down in any case and also it carries controlling traffic. In the case of Cisco (and most vendors), the Default Native VLAN is VLAN 1.Infact in a new switch
DEFAULT VLAN = NATIVE VLAN = VLAN 1
Native VLAN concept exists in case of encapsulation type 802.1Q (802.1Q supports untagged traffic while ISL does not support untagged traffic).We configure trunk port with a Native VLAN, and whatever traffic arrives on that port without an existing VLAN tag, gets associated to your Native VLAN.
Below table shares comparison between both Default VLAN and Native VLAN –