From: Kulcsár
Date: Mon May 22 2006 - 12:25:13 ART
I also did that lab and I think ISL is the solution.
Another task in that lab requires to use native vlan on another interface of the switch ("traffic from vlan6 should not be tagged with a VLAN header when it is sen over this trunk link")
If you use 'vlan dot1q tag native' that configures all dot1q trunks to be all-tagged.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Gianpietro Lavado
Sent: Saturday, May 20, 2006 6:38 PM
To: Radoslav Vasilev
Cc: Cisco certification
Subject: Re: only tagged frames over a trunk
Hi Radoslav,
I think that would be a valid solution too, because they're only telling you to tag every vlan in the trunk. If they told you something additional like 'should not use the command 'vlan dot1q tag native'' (as IE does in a later lab) or to 'use Cisco's propietary trunking protocol', only then the only valid solution would be ISL for this case...
However, your email has made me think further, and that phrase "tagged with VLAN header" makes me remember that ISL actually adds an additional header to the frame, but dot1q only tags the existing header...so maybe when they say "vlan header" thay are asking for the additional ISL header instead of tagging the existing one...any ideas?
Gianpietro
On 5/20/06, Radoslav Vasilev <deckland@gmail.com> wrote:
>
> Hi Group,
>
> This one should be easy and still it got me thinking:
>
> The task is to create a trunk interface between two switches with the
> requirement of "all the trafifc should be tagged with VLAN header".
>
> The solution from InternetworkExpert (lab 2, task 1.2) is ISL. My
> question: could a dot1q trunk be a solution, if the addtional ``vlan
> dot1q tag native`` command is used?
>
> According to the docs, the effect will be tagging on egress port and
> dropping untagged native vlan frames on ingress port.
>
> What do you think?
>
>
> Rado
>
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