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Fabrizio Lombardozzi
lombardo at dia.uniroma3.it
Thu Mar 28 19:18:36 CET 2002
Hi Henk, first of all I'm sorry for the very long delay of this answer. I hope that my answers will be still usefull. On Thu, 21 Feb 2002, Henk Uijterwaal (RIPE-NCC) wrote: > Hi Fabrizio, > > > my name is Fabrizio Lombardozzi, I've developed a system to monitor > > inter-AS routing instabilities (route flaps) at the Computer Networks > > Research Group, of the Roma III University, Italy. The system retrieves > > BGP data from RIS, and produces interactive graphs and animations using > > a graph drawing engine and intuitive morphing animations, with a > > reasonably friendly web graphic user interface (it's an applet). I will > > be grateful if you could give me some comments and hopefully > > suggestions. > > > > At the url http://www.dia.uniroma3.it/~compunet/ you will find detailed > > instructions to start the applet and also a gallery with screenshots and > > animations. > > This is a really nice tool. Two questions: > > 1. Is there a possibility to filter only paths between 2 AS's? When > debugging a problem between AS1 and AS2, I'd like to see updates > sent by AS1 that somehow involve AS2, not everything. > Yes it is possible. When you set "query parameters" you can filter paths between 2 AS's typing their number in the text field on the bottom of the window. For more details there is a short guide at: http://taurasi.dia.uniroma3.it/~lombardo/flapviewer/howto.html > 2. Data collection seems to take "forever", well, 10 minutes, but still > long. Do you have any idea what causes this and would there be > any mileage in mirroring/copying the DB, so one doesn't have to do > queries over the net? > Yes data collection is quite long, I think there is a bottleneck close to my server. (Consider that, from here, a simple query to the RIS takes about 5 mins...). Surely mirroring would improve performance. > I might have more questions after I've played with this some more. > > Henk > If you have more questions I will be glad to answer much more quickly. > > ps. This would be a nice thing to present life at RIPE42 in Amsterdam, > late April. > I'd really like to come at RIPE42, but I have just started a new job for a private company, so I think that it will not be possible for me to be present. Thank you for the interest in FlapViewer Fabrizio
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