[c-nsp] XR on GNS3

[Tim Warnock]

> XRv is simple control-plane of XR in a VM. This is why L2 forwarding isnt
> supported (though is configured).
> XRv9000 is full control- and data-plane and much tighter coupling of the two.
> L2 forwarding should work, but L2VPNs and such will fail miserably.
> 
> q.

XRv9000 6.4.1 works fine - the next issue is that the forwarding plane is limited to 128kbps without a licence...