[c-nsp] Switch lights rapid blinking

[A.L.M.Buxey at lboro.ac.uk]

Hi,

> Alan, there are many normal things that can cause this, like ARP broadcast, unknown unicast especially in a large flat nets.

as I said, it could be the usual blinking...they do blink a lot even in
a test/lab environment... and checking whats going on on uplink
might be key for flat network checking. the checking counters/processor etc
that was also mentioned is useful.  

alan