The MPLS-OPS Archive

[Aamer Akhter <aakhter@cisco.com>]

On 5/30/03 10:46 AM, "Vinay Bannai" <bannai@pacbell.net> wrote:

> Edmund,
> 
> The concept of native VLAN and untagged traffic is not new and it used quite
> a bit with VLAN-L2 devices.
> My understanding of native VLAN as it applies to untagged traffic is as
> follows:
> - A native VLAN is something which is assigned globally to a switch

Slight correction, The "native" vlan is assigned per 802.1q trunk port.

> - On trunk port, you can get both tagged and untagged traffic
> - The untagged traffic is assigned to a native VLAN group
> - The untagged traffic is then forwarded to the ports on this native VLAN
> 
> I am not exactly sure if this behavior is uniform across all vendors, but
> this is something that is prevalent on the Cisco switches.
> 
> Vinay
> -----Original Message-----
> From: Mourad BERKANE [mailto:mourad.berkane@lambdanet.fr]
> Sent: Friday, May 30, 2003 1:49 AM
> To: 'Edmund Kueh / ICN Malaysia'
> Cc: mpls-ops@mplsrc.com
> Subject: RE: [MPLS-OPS]: VLAN untagged and native frames
> 
> 
>>> VLAN untagged
> 
> Never heard before, VLAN untagged is a joke (or a new 802 standard) :-)
> 
> what can i say is that if you tunnel (via a pair of LSPs or via
> L2VPN/VPLS) an ethernet traffic (tagged or not), you could configure on your
> PEs ethernet interfaces the encapsulation as follow:
> 
> - 802.1q ("native frames", you must specify all VLAN ID you would like to
> tunnel)
> - untagged (it is a transparent service, your traffic could be tagged or
> not)
> 
> hope this help
> 
> Regards,
> Mourad
>   -----Message d'origine-----
>   De : Edmund Kueh / ICN Malaysia [mailto:Edmund.Kueh@siemens.com]
>   Envoyé : vendredi 30 mai 2003 03:36
>   à : mpls-ops@mplsrc.com
>   Objet : [MPLS-OPS]: VLAN untagged and native frames
> 
> 
>   Hello
> 
>   Anyone know whats the difference between VLAN untagged and native frames
> ?
> 
>   If a frame with VLAN ID = 0, do u call it, VLAN untagged or native frame
> ?
> 
>   Greetings
>   Edx
> 
> 
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> 

-- 
Aamer Akhter / aa@cisco.com
NSITE - cisco Systems


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