I have couple of questions on Route Flaps at NAP's.
1)How often do they happen? (per hour, per day etc)
2)When route flaps occur, on an average how many routes are flapped?
Any pointers indicating the above statistics will be helpful.
Thanks,
-Ramesh
Hi Ramesh!
Check out:
and more specifically,
http://www.merit.edu/ipma/realtime
I believe that these pages will have some of the information that you are
looking for.
Let me know if you have any questions.
-abha 
Ramesh,
Merit has done studies on this in the past. Their data is on
at
http://www.merit.edu/ipma/reports/
That said, why are route flaps important? In the past, its
been said that certain length prefixes were the cause of lots of
routing instability on the Internet, and much effort was
spent on developing elaborate dampening algorithms and policy
efforts were spent on determining how to set the parameters
on such a system.
As it turns out, these aren't important ... prefixes flap pretty
much independent of length. And while dampening will help prevent
lots of up/down cyclic behavior and resulting churn, the whole issue,
I think, got a lot more intellectual curiosity that it deserved,
not to dissuade you
Other than it being something that one can count, I'm not sure why
route flaps, in general, are interesting.
-scott
Check out:
http://www.merit.edu/~ipma/instability/
Merit has done a good job putting together a collection of tools to
analyze stuff on the network using the RS's or otherwise.
http://www.merit.edu/~ipma/routing_table/
Might also prove interesting to look at routing table growth, routes being
exchanged, etc.
-jh-