From: Chirag Arora (carora1977@gmail.com)
Date: Sat Jul 15 2006 - 04:30:13 ART
In addition the QnQ is used in Metro Ethernet Environment to prevent
overlapping Vlans. The customers who are connected to MEN may be sending the
same Vlan tags, so in order to avoid the overlapping, the SP adds his own
tag to that.
chirag
On 7/15/06, James Ventre <messageboard@ventrefamily.com> wrote:
>
> IEEE 802.1Q-in-Q VLAN Tag Termination on Subinterfaces
>
> IEEE 802.1Q-in-Q VLAN Tag Termination simply adds another layer of IEEE
> 802.1Q tag (called "metro tag" or "PE-VLAN") to the 802.1Q tagged
> packets that enter the network. The purpose is to expand the VLAN space
> by tagging the tagged packets, thus producing a "double-tagged" frame.
> The expanded VLAN space allows the service provider to provide certain
> services, such as Internet access on specific VLANs for specific
> customers, and yet still allows the service provider to provide other
> types of services for their other customers on other VLANs.
>
>
> http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_feature_guide09186a00801f0f4a.html
>
>
>
> Jens Petter wrote:
> > Hi,
> >
> >
> >
> > 802.QinQ
> >
> >
> >
> > I am strying to find some information of this topic for the SP lap, but
> a
> > search at cisco and google search turns up nothing
> > at all.. Strange since it is in the blueprint??? How can they test on
> > something that is not documented???
> >
> >
> >
> > Anybody that can share some info or guide me towards it?
> >
> >
> >
> > Thanks
> >
> >
> >
> > Jens
> >
> > _______________________________________________________________________
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>
> _______________________________________________________________________
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>
-- Chirag
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