[c-nsp] Smallest router that supports Q-in-Q tag termination

[Anton Kapela]

> What is the smallest router that supports Q-in-Q tag 
> termination?  We will be using the Motorola AXS2200 Fiber to 
> the Prem chassis to get the tag-stacked packets to the router.

The 1710. Roll 12.3t or 12.4 mainline and you're set.

-Tk