[c-nsp] Conditional advertise-map

[Phil Mayers]

> with the SMALTA work, they've looked at how to optimize their
> compression algorithms to (try to) efficiently maintain a fully
> optimized! , compressed FIB while, all the while, dealing with
> incoming routing updates (prefixes, aggregates, etc.) appearing and
> disappearing.

Tell me, did they use a 600MHz CPU when they were doing this work? ;o)