[c-nsp] BFD bug in IOS SXF6

[Anton Kapela]

> What we really need is some kind of supervisor module with a 
> much faster CPU. Like the rsp720, only supported in the 6500. 
> Grumble 7600 split grumble.

I'm not sure 'more' cpu to run the same code is the answer. I think (and
I'm 100% sure Cisco DE's know it, talk about it a lot, and likely cannot
garner enough internal interest for) the need is either some form of
multi-tasking RTOS instead of the best-effort, cooperative,
run-to-completion-with-some-hacks multitasking that IOS offers today, or
perhaps dedicated hardware and appropriate pre-emptive ipc/signalling
from linecards to rp/sp components.

Apparently the cost/benefit tradeoffs aren't in favor of some flavor of
RTOS being pushed down to boxes that a) unsophisticated enterprises and
b) ISP's are buying (cat6/7600). I would wager, if there was significant
demand for features that depended on real-time features from enough
customers with enough potential revenue on the line, this would have
been solved in some substantive way years, maybe decades ago. Anyway,
while c-nsp discussions are fun, a bunch of us bleeding-edge, 'lets make
it better' types aren't likely to represent the majority of Cisco's
customers. I won't get stable high-rate ospf hellos anytime soon, nor
will any international 'backbones' get stable and dependable BFD in the
short term: our special needs simply don't matter enough.

-Tk