[c-nsp] Cheapest Cisco desktop switch that supports Q-in-Q/802.1Q VLAN encapsulation/double-tagged VLANs/Stacked VLANs

[Dale W. Carder]

On Jul 7, 2010, at 10:54 PM, Frank Bulk wrote:
> 
> And why does one page on Cisco's site say: 
> Q. What is 802.1Q Tunneling? Is it an IEEE standard?
> A. With 802.1Q Tunneling, a service provider's switch can tag on a second
> 802.1Q tag on top of the customer's 802.1Q tag. This feature is sometimes
> referred to as "Q-in-Q." The Cisco implementation is proprietary and does
> not interoperate with other implementations.

false

> There is currently no effort to
> make this into a standard.


false, see 802.1ad-2005

What this text really means is that they use a different ethertype.  So, 
if you connect a cat switch to other vendor kit, you need to make sure you 
have things match.  Usually this is not really an issue as long as you are 
aware of it (and test for it) well in advance.

Dale