[c-nsp] ASR100x route tables sanity check

[sthaug at nethelp.no]

> > What happens if ESP runs out of FIB slots?
> 
> My SE (and someone from one of the BU's at Cisco) said that 
> they think the only boxes that stop forwarding traffic 
> altogether due to congested FIB's are IOS XR boxes.
> 
> All other boxes (IOS) will process look-ups in the control 
> plane CPU. This implies IOS XE will work the same way, 
> although I have no real evidence of this.

It would be nice to have a knob to turn software forwarding off
completely. Makes it easier to find forwarding problems because 
they tend to be visible right away when traffic stops...

Steinar Haug, Nethelp consulting, sthaug at nethelp.no