Three more slides

More stuff derived from the several days' worth of debug
ip bgp updates...

There are three slides in the shar archive below:

  -- is the first; that shows the up transitions
     per hour for the top twenty most flap-propagating
     neighbours of AS 1239. SPLK is SprintLink,
     PSIAGG is an as-set due to proxy-aggregation done
     on some of PSI's netblocks. The as-set is

     You will quickly see why there are three slides
     instead of one...

  -- is the second, and shows AS 1800 decomposed.

  -- is the third, and shows AS 690 decomposed. is intersting; it shows that PSI is flapping
     *alot* at AS 690. This could be due to MAE-EAST
     flakiness. It also shows that AS 690 propagates
     alot of flaps from AS 3561. I don't know why.

     PSI, ANS, were your peering sessions flapping
     badly at MAE-EAST earlier this week?

Total number of flaps/hour in these graphs and in the
previous ones derived from this data set is 6309 (1.75/hour).

(The mean number of bgp table changes/hour in my first graph
is 4.32/hour. Math was done on a Pentium. :slight_smile: Oh, and the
data sets covered different periods and had different

As I said, Sprint propagates all sorts of flaps all over
the place...

At NANOG I shall be talking about ways each of us can
help reduce the overall number of flaps.

What is still crunching now (and hopefully will finish
soonishly... i/o is slow) is an attempt to track intervals
betweens up and down transitions for any given prefix, the
number of prefixes that flap in any given transition, and a
very ugly attempt to show how much CIDRizing blocks of
prefixes could help).

- --
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