[c-nsp] BFD on 12.2(33)

[sthaug at nethelp.no]

> We started out with 50ms, but we had to increase the timers to 200ms to
> get rid of the flapping. But even at 200ms I see about one BFD false
> negative a day.
> We want to achieve SDH-like restoration times, so I would like to use
> 50ms*3 .... if it would work.....

Despite all the nice words about BFD, from several vendors, I think it
is still rather optimistic to hope for SDH-like restoration times.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no