From: Ed Lui (edwlui@gmail.com)
Date: Wed Oct 12 2005 - 13:22:01 GMT-3
Chris,
I understand this part. I actually missed the detail. I shut the vlan 1
down, created 3 vlans without defining native on the trunk port of the
switch and the port on the router. If is still working fine. Any idea ?
Thanks,
Ed Lui
On 10/12/05, Chris Lewis <chrlewiscsco@yahoo.com> wrote:
>
> 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.org <http://ieee.org/>but 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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