From: KSGoh (kianseng.goh@gmail.com)
Date: Tue May 23 2006 - 12:38:37 ART
i tried to use the cmd, vlan dot1q tag native on 1 switch, and leave the
vlan1 on other switch untag...
surprisingly, i'm able to 'ping' the ip of vlan1 from other switch..
if vlan1 is tag on switch, and untag on other switch.. it shouldn't be able
to 'see' each other rite ?
is there any way to test this cmd ?
----- Original Message -----
From: "James Ventre" <messageboard@ventrefamily.com>
To: "Gianpietro Lavado" <gianpietro1@gmail.com>
Cc: "Radoslav Vasilev" <deckland@gmail.com>; "Cisco certification"
<ccielab@groupstudy.com>
Sent: Sunday, May 21, 2006 1:40 AM
Subject: Re: only tagged frames over a trunk
> Typically, "tagged" means 802.1Q and "encapsulate" means ISL.
>
> James
>
>
>
>
> Gianpietro Lavado wrote:
>> 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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