Re: DOT1Q NATIVE VLAN STANDARD or NON-STANDARD

From: Chris Lewis (chrlewiscsco@yahoo.com)
Date: Wed Oct 12 2005 - 13:15:28 GMT-3

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There is a default native vlan of 1. If you want a vlan other than that to not have the dot1q header, you need to specify that vlan to be the native. Both ends of the trunk need to agree which vlan that is, so for the purposes of the exam, you may need the command to make things match.
 
Chris

Ed Lui <edwlui@gmail.com> wrote:
Hi group,
I have no luck finding out why we need native vlan in dot1q. I understand
that native vlan should be defined on a trunk port. I came across a router
on a stick lab scenario, which I did not define the native vlan and it is
still working fine. Read through the dot1q standard on
ieee.orgbut still can not figure out my question.
So, what is the difference between having a native and not having a native
vlan defined ? The only thing I can think of is, tagged frame can carry QoS
information. Other than that, what is the benefit or difference between
tagged and untagged frames ? Why define a native ?

Thanks in advance for any help or hint,

Ed Lui

TRUNK W/O NATIVE VLAN
2621=============================3550

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