Re: Flap Viewer

[Fabrizio Lombardozzi <]

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