Re: No traffic on trunk without vlan header.

From: san (san.study@gmail.com)
Date: Wed Dec 07 2005 - 16:55:54 GMT-3


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
>
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