[c-nsp] QinQ

[sthaug at nethelp.no]

> > Lots of the switches support QinQ, e.g. 3550, 3650, 3750, 6500/7600.
> 
> And what about routers?
> 
> The scenario would be:
> 
>     | .1q customer trunk
> +------+
> | 3550 |
> +------+
>     | q-in-q trunk
> +---------+
> | 7206VXR |
> +---------+
>     |
> (L2TPv3 cloud)
>     |
> +---------+
> | 7206VXR |
> +---------+
>     | q-in-q trunk
> +------+
> | 3550 |
> +------+
>     | .1q customer trunk
> 
> I am not sure that the routers need to explicitly support QinQ, maybe they
> will just encapsulate whatever they see coming on their .1q subinterface? I
> am probably being too naïve here...

In your scenario the routers just need to support normal 802.1q (single
tagged) ports - and a sufficiently large MTU.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no