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Re: BGP route tracking.

  • From: cowie
  • Date: Fri Aug 15 13:41:45 2003


Some updated images of routing table size and 7-day prefix withdrawals: 

    http://gradus.renesys.com/aug2003/blackout3-rtsize.gif 

    http://gradus.renesys.com/aug2003/aug7-aug15-withdrawals.gif

(Blackout is event #3 on the right.)

We're about halfway back to the table sizes we started with yesterday 
before the grid tripped. If it trends the same way through the 
afternoon, it could be back to its old self sometime around midnight 
GMT; previous experience suggests that it might stabilize somewhat 
higher than before the event.  

At any rate, steady improvement as power returns across the East.    

----------
James Cowie
Renesys Corporation
cowie@renesys.com





> Okay, here are a couple quick screenshots of what we're looking at 
> tonight.
> 
> First, a plot that shows the routing table size shrinkage since the 
> onset of the blackout at 16:13:07 +/- EDT, across a group 
> of routers. 
> 
>      http://gradus.renesys.com/aug2003/blackout1-rtsize.gif 
> 
> Second, a wider-angle 3D plot of prefix withdrawal rates over the 
> last week, reported by various peers (one line per). 
> 
>      http://gradus.renesys.com/aug2003/aug7-aug14-withdrawals.gif
> 
> The blackout is the big event at the right hand edge (#3). 
> 
> Note the sustained high rates of route withdrawal that have been 
> the norm since the onset of MSBlast.  Unlike typical single-cause 
> events (like the one marked #1), MSBlast scanning has caused 
> prefix withdrawal rates to gently "lift off" into a noiser mode 
> across the board, lasting for days (so far).
> 
> > (im just getting bored waiting for us to run out of fuel)
> 
> Ouch .. 
> 
> 
> ----------
> James Cowie
> Renesys Corporation
> cowie@renesys.com
> 





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