Native VLAN Discussion - Prunning and what is and isn't tagged (Control Protocol)
So the last few hours I have been reading about the native VLAN on Cisco Switches and have found allot of contradicting \ misinformed opinions on the internet.
First of all Clause 9 of the 1998 802.1Q standard defines
Frames belonging to the native VLAN do NOT carry VLAN tags when sent over the trunk. Conversely, if an untagged frame is received on a trunk port, the frame is associated with the Native VLAN for this port.
CDP/VTP/PAgP/UDLD are always transmited over VLAN 1, if Native VLAN is 1 then will be transmited in untagged form, if VLAN 1 is tagged (Native VLAN is other VLAN then 1), protocols will be tagged with 1.
Re: Native VLAN Discussion - Prunning and what is and isn't tagg
All what you read is correct indeed. There is no contraddiction.
I just suggest to read the difference between ISL and Dot1Q encapsulation on ine.com to better understand the role of a native VLAN.
Just one thing more. DTP and STP have no direct relation to the vlans... not really. the implementation of these protocols can strongly affect the propagation and the extension of the vlan domains. So , although their implementation is independent, they need indeed each other
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