WG Chair hat off
On 07/10/2008, at 11:25 PM, Randy Bush wrote:
A source of a relatively complete set of individual allocations can
be
retrieved from http://bgp.potaroo.net/stats/nro/delegated
then take a large set of updates and examine each prefix - the Route
views update archive is a good source
and then perform a lookup into the individual allocation list for
each
updates / withdrawn prefix
and report anomalies that straddle multiple allocations
is one way to understand the level of historical occurrence.
again, could you give us one or two examples of this actually
occurring,
an asn aggregating prefixes from multiple rirs, i.e. what not having
multiply signed roas would preclude?
you did say "and this case, although not common, has been visible in
the
routing table already."
I did say that and I based that comment on my earlier work in
constructing the BGP report and looking at aggregation possibilities
in the routing table and figuring out why the code was failing for
certain advertised prefixes (its always the bugs that are more
interesting than the working code). That was over 4 years ago, and
after correcting (!) the code not to look for such cases where the
prefix straddled across allocation boundaries I've not had to go back
there again until this conversation.
So if you are after current examples, then its a case of
reconstructing the code and running through the routing updates again.
It may be some weeks before I can get around to this task personally.
Others may be better situated to perform such an investigation in a
faster timeframe.
Geoff
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