RE: No traffic on trunk without vlan header.

From: Gustavo Novais (gustavo.novais@novabase.pt)
Date: Wed Dec 07 2005 - 17:15:40 GMT-3

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Hi

So may I conclude that for this specific task, both answers would be
correct? Or by definition we should KISS* and go through vlan dot1q tag
native.
BTW, This is a global setting. Which means that if you tag one trunk's
native vlan, you tag them all. That may be a constraint!

Thanks for your replies

Gustavo Novais

*KISS -- Keep It Simple and Stupid -- do not start thinking things :)

-----Original Message-----
From: John Matus [mailto:John.Matus@tokiom.com]
Sent: quarta-feira, 7 de Dezembro de 2005 20:09
To: san
Cc: ccielab@groupstudy.com; Gustavo Novais; nobody@groupstudy.com
Subject: Re: No traffic on trunk without vlan header.

since dot1q does not tag the natvie vlan, the easiest solution would be
to
tag the native vlan with the "vlan x tag native" commnand.

Regards,

John D. Matus
Technical Support / PAS
Fujitsu Consulting
626-568-7716
John.Matus@tokiom.com

             san

             <san.study@gmail.

             com>
To
             Sent by: Gustavo Novais

             nobody@groupstudy <gustavo.novais@novabase.pt>

             .com
cc
                                       ccielab@groupstudy.com

 
Subject
             12/07/2005 11:55 Re: No traffic on trunk without

             AM vlan header.

             Please respond to

                    san

             <san.study@gmail.

                   com>

Gustavo,

My reading says that:

VTP messages are multicast and a limit of one hop by cisco switches.
Also VTP messages are encapsulated in default vlan (vlan 1). These
messages flow only over trunks.

/SAN

On 12/4/05, Gustavo Novais <gustavo.novais@novabase.pt> wrote:
> Hi,
>
>
>
> When faced with a question that states that we must "ensure that all
> traffic that is sent over this link is tagged with a vlan header" and
> the link is a dot1q trunk, the way I see it we have two options:
>
>
>
> We can change the trunk's native vlan and not allow it on the trunk.
>
> Or
>
> We can use the vlan dot1q tag native, and guarantee that there is no
> untagged vlan on the trunk.
>
>
>
> I have two questions regarding this:
>
>
>
> What happens on both situations to DTP,VTP, etc traffic? Are their
PDU's
> encapsulated also?
>
> Why would we choose one method over another (besides the simplicity of
> the latest)?
>
>
>
>
>
> TIA
>
> Gustavo Novais
>
>

• Next message: Mike Flanagan: "Injecting default route only with loss of IP route WAS: Re: IE"
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• Maybe in reply to: Gustavo Novais: "No traffic on trunk without vlan header."
• Next in thread: Godswill Oletu: "Re: No traffic on trunk without vlan header."
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