On Mar 14, 2010, at 1:33 PM, Amund Kvalbein wrote:
Folks,
In this context, I think you might be interested in a measurement
study that will be presented at INFOCOM this coming week. The focus
of the study is BGP scalability with respect to churn rates. We have
analyzed six years of Routeviews BGP update traces from four
monitors in different tier-1 networks.
Some of the main findings are that
- BGP churn varies widely on many time scales, and cannot be
understood through "black-box" statistical analysis.
- The most severe churn experienced by these monitors are caused by
mis-configurations and events that are local to the monitored AS.
- Surprisingly, as much as 40% of churn consists of duplicate
announcements, which are unnecessary for correct protocol operation.
This figure has been pretty constant over our measurement period.
we did a measurement study to understand the causes of such excessive
duplicate announcements, the results are reported in the following
paper:
"Investigating Occurrence of Duplicate Updates in BGP Announcements"
http://www.cs.ucla.edu/~jpark/dupbgp.pdf
to be presented at PAM conference next month
An earlier presentation can be found at
http://www.cs.ucla.edu/~jpark/grow-5.pdf
- After filtering out duplicates, local effects and anomalies caused
by a few specific events, we find that there is an increasing trend
in "baseline" churn over the past six years, but that this growth is
quite modest, and much slower than the growth in the DFZ RIB size.
The paper can be found at
http://simula.no/research/nd/publications/Simula.nd.435
Comments are always welcome.
Regards,
Amund
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