BGP community attribute taxonomy
benoit.donnet at uclouvain.be
Thu Nov 15 10:05:55 UTC 2007
Dear Nanog community,
During the past years, we have seen an increasing usage of the BGP
community attribute. For instance, in a recent BGP table dump from
routeviews, 99% of the routes stored by the router carries BGP
In this context, we are currently working on a BGP community
taxonomy, i.e., we want to classify and document communities
according to their usage. We describe our taxonomy on the following
Based on this taxonomy, we tried to collect as much as possible
information on BGP communities. This was a daunting task as we
mainly relied on public database, such as whois server and ISP web
Our current database of classified BGP communities currently contains
more than 12,000 entries.
When running our database and taxonomy on recent BGP table dumps from
RouteViews and RIPE (last dump from September 2007), we were only
able to classify, on average, 20% of the encountered communities.
Based on this result, we ranked the unclassified BGP communities.
Here is the top 10 of most seen ASes using uncommented communities:
You can find the top 100 on the following url: http://
www.info.ucl.ac.be/~donnet/communities.html It gives the AS number
as well as, for each AS, the various unclassified communities and
their total frequency (i.e., the number of times the AS with
unrecognized communities is encountered in table dumps).
If you have any documentation regarding these communities, it would
be very helpful if you can send us back this information. The
easiest way for you is probably to reply to this email and attach the
information (text, PDF, doc file, ...).
When our database will be enough representative of the used BGP
communities, we will made it freely available. We will also propose
a way for updating (adding or removing) BGP communities information
in our database.
Thanks in advance.
Dr. Benoit Donnet & Prof. Olivier Bonaventure
Dr. Benoit Donnet
Université Catholique de Louvain (UCL)
Faculté des Sciences Appliquées - Département d'Ingénierie
Place Sainte Barbe, 2
Phone: +32 10 47 87 18
Home page: http://inl.info.ucl.ac.be/donnet
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