[c-nsp] IOS reliability

[Peter Rathlev]

Hello,

We've been asked to asses some network parameters regarding a SLA for an
important business system. We've worked out the "usual" stuff with MTBF
and line reliability and so forth.

What we don't have is some kind of statistical material on the stability
of the IOS software we're running. The closest we've come to this is the
DCAP and Safe Harbour ducuments, but they're focusing on functionallity
and don't seem concerned with long term stability as much. It seems a
little naive assuming a box keeps running as long as noone makes any
changes. (Though I don't recall this being any very big problem...)

We're mostly running C6k with 12.2SXF and 7200 with 12.4 main, and I
know it's very complicated to give some figures, but do any of you know
of any studies regarding IOS stability in general?

Otherwise we could of course just assume the stability, and mention that
unprovoked software crashes are negligible.

Or are we making our lives overly complicated this way? :-)

Thanks,
Peter