[c-nsp] TCAM refresher

[Florian Weimer]

* Chris Woodfield:

> To answer a question earlier in the thread, a TCAM overflow event
> causes only the prefixes that don't fix to be process switched. The
> TCAM is populated in order of longest-prefix-first, which means that
> in the case of TCAM overflow the shortest prefix matches are the ones
> that will be software-switched.

Does this include entries for directly-connected hosts?  That could be
potentially very bad.