Vlans

[muraripadhan]

Dears

Please describe me 

Q-1 what is native vlan

Q-2 what are the benefit of native vlan

Q-3 What is different between Vlan 1 and native vlan

Q-4 How native vlan works

[Mark Malone]

Hi

its legacy and should avoid using it if you can these days , these questions have been asked multiple times in the forum if you search native vlan in the search bar in top right you will see hundreds of posts explaining it and how it works , I provided the link below  

https://supportforums.cisco.com/discussion/11700441/what-difference-between-default-vlan-and-native-vlan

search link with all questions regarding native vlan

https://supportforums.cisco.com/search/site/native%2520vlan?f%5B0%5D=sm_og_group_ref%3Anode%3A5896

[Julio E. Moisa]

Hi

Q-1 what is native vlan

As normal the traffic between 2 switches is tagged adding the respective vlan. Now, by default the vlan 1 is the native vlan for a switch, as good security practice you should disable the vlan 1 (through the interface vlan 1 / shutdown). Once I read the native vlan was created initially in order to mitigate compatibility problems with switches. The frames untagged over a trunk are assigned to the native vlan. The native vlan must not be configured under access ports. 

Q-2 what are the benefit of native vlan

All the vlans will be tagged
There will not have leaking of information.

Q-3 What is different between Vlan 1 and native vlan

As it was mentioned previously the  vlan 1 is the default vlan on the switches, it cannot be removed but it can be disabled, now the vlan 1 is used by default for: native vlan, cdp, vtp and others task. So by security purposes the vlan 1 is not good idea to be used. The Native vlan can be any vlan but it should not be used under access ports, just under trunk interfaces.

Q-4 How native vlan works

The following link could be useful

https://www.youtube.com/watch?v=REGy1ycvf4k