More stuff derived from the several days' worth of debug ip bgp updates... There are three slides in the shar archive below: -- S.ps 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 {174,1800,690,2149}. You will quickly see why there are three slides instead of one... -- T.ps is the second, and shows AS 1800 decomposed. -- U.ps is the third, and shows AS 690 decomposed. U.ps 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. :) Oh, and the data sets covered different periods and had different points-of-view.) 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). Sean. - -- # This is a shell archive. Save it in a file, remove anything before # this line, and then unpack it by entering "sh file". 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