[c-nsp] 7604/sup32 (minor correction)

[Mark Boolootian]

> If you don't use XLs and then you wind up with FIB exception and 
> packets forwarded in software.

Packets for those routes that haven't been installed in the FIB...

I'm probably a bad person for asking, and not first searching, but can 
someone remind me what happens when the FIB fills - what is the process for
deciding what gets added and what gets dumped from the FIB?