Native vlan

[jonk34567]

CDP, VTP, STP travel through native vlan or Vlan 1 ?

[Georg Pauwen]

Hello,

is this an exam question ? CDP and VTP will always use Vlan 1, regardless of the native Vlan. STP BPDUs are always untagged as far as I recall, and have no association with a native Vlan.

[Leo Laohoo]

Here's something to make you think, Jonk. 

An ethernet cable has four pairs of wires:  Pair A, Pair B, Pair C and Pair D. 

Question:  Which pair(s) does CDP, VTP, STP travel?

[Julio E. Moisa]

Hi

By default the VLAN 1 is the native VLAN on a switch, protocols like CDP, VTP use the VLAN for their purposes that is why a good pratice is not use the VLAN 1, multiple information is passing through that VLAN. 

STP will create an instance for VLAN 1 and all the untagged frames will be redirect through the VLAN 1 (native vlan by default) over the trunk interfaces. That is other reason to change the native VLAN. 

:-)