[c-nsp] TX low alarm warning

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

Hi,

> For some reason especially on 4500X 3.7 code we have also seen this message
> on ports which are left no shut, and they have an SFP in it. It was
> seriously polluting our logs so we wrote this:

+1

> logging discriminator LOGFILTER mnemonics drops
> SFF8472-5-THRESHOLD_VIOLATION
> logging host x.y.z.w discriminator LOGFILTE
> logging host x.y.z.q discriminator LOGFILTE
> logging console discriminator LOGFILTER

and +2 for that recipe :-)

alan