From: Ed Lui (edwlui@gmail.com)
Date: Wed Oct 12 2005 - 15:17:28 GMT-3
That is exactly my question. Looks like native vlan is not to be used
mandatory.
On 10/12/05, James Ventre <messageboard@ventrefamily.com> wrote:
>
> Just set it up to tag all (don't use the physical interface - only use sub
> interfaces)
>
> interface FastEthernet0/0
> no ip address
> duplex auto
> speed auto
> !
> interface FastEthernet0/0.1
> encapsulation dot1Q 2
> ip address 1.1.1.1 <http://1.1.1.1/> 255.255.255.0 <http://255.255.255.0/>
> no snmp trap link-status
> !
> interface FastEthernet0/0.2
> encapsulation dot1Q 4
> ip address 2.2.2.2 <http://2.2.2.2/> 255.255.255.0 <http://255.255.255.0/>
> no snmp trap link-status
> !
>
>
> James
>
>
>
>
>
> De Witt, Duane wrote:
>
> You're right, but it's a good place to start. With regard to this, I
> haven't seen a similar configuration on routers, so if you were running
> router on a stick the router would be sending untagged native vlan packets
> to a switch that is tagging all vlans. How does this work?
>
> ------------------------------
>
> *From:* James Ventre
[mailto:messageboard@ventrefamily.com<messageboard@ventrefamily.com>]
>
> *Sent:* 12 October 2005 07:51 PM
> *To:* De Witt, Duane
> *Cc:* Ed Lui; ccielab@groupstudy.com
> *Subject:* Re: DOT1Q NATIVE VLAN STANDARD or NON-STANDARD
>
> *>Bottom line is that there is always a native VLAN in Dot1Q*
>
> Always is a pretty strong word:
>
> IOS_4507R(config)#vlan dot1q tag native ?
> <cr>
>
> CatOS_6500(enable) set dot1q-all-tagged enable ?
> <cr>
>
> James
>
>
>
> De Witt, Duane wrote:
>
> The basics here are that Dot1Q has a native VLAN which is a VLAN that
>
> doesn't have a VLAN tag. ISL doesn't have this since all VLAN's are
>
> tagged.
>
> If you don't define a native VLAN it defaults to VLAN 1. The default can
>
> be changed to make any VLAN native which simply means it will not carry
>
> a VLAN tag in the header. Bottom line is that there is always a native
>
> VLAN in Dot1Q, whether you define it or not.
>
>
>
> Does that answer your question?
>
>
>
> -----Original Message-----
>
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com
<nobody@groupstudy.com>] On Behalf Of
>
> Ed Lui
>
> Sent: 12 October 2005 06:03 PM
>
> To: ccielab@groupstudy.com
>
> Subject: DOT1Q NATIVE VLAN STANDARD or NON-STANDARD
>
>
>
> 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/><http://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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