The Cidr Report

Mailman List Mirror (Read Only)
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This is an auto-generated mail on Fri Oct 2 12:00:00 PDT 1998
It is not checked before it leaves my workstation. However, hopefully
you will find this report interesting and will take the time to look
through this to see if you can improve the amount of aggregation you
perform.

The report is split into sections:

   0) General Status
   
      List the route table history for the last week, list any possibly
      bogus routes seen and give some status on ASes.

   1) Gains by aggregating at the origin AS level

      This lists the "Top 30" players who if they decided to aggregate
      their announced classful prefixes at the origin AS level could
      make a significant difference in the reduction of the current
      size of the Internet routing table. This calculation does not
      take into account the inclusion of holes when forming an aggregate
      so it is possible even larger reduction should be possible.

   2) Weekly Delta

      A summary of the last weeks changes in terms of withdrawn and
      added routes. Please note that this is only a snapshot but does
      give some indication of ASes participating in CIDR. Clearly,
      it is generally a good thing to see a large amont of withdrawls.

   3) Interesting aggregates

      Interesting here means not an aggregate made as a set of
      classful routes.

Thanks to xara.net for giving me access to their routing tables once a
day.

Please send any comments about this report directly to me.

Check http://www.employees.org/~tbates/cidr-report.html for a daily
update of this report.

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Quote From: Tony Bates
Message ID: 199810021900.MAA18952@lovefm.cisco.com

} AS Summary
} ----------

} Number of ASes in routing system: 4081

And the highest assigned AS is close to 12000. Hence the
space is rather sparcely populated.

But, and this is a considerable but, not all of the eight
thousand ASes that are missing from the CIDR report are
unused. There are a lot of ASes out there that are in use,
but don't show up on a global routing table. Most of these
are regional backbone or exchange ASes that don't themselves
terminate any routes. They are only visible to networks
that are connected to them.

And then there's the RBL AS, 7777.

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But, and this is a considerable but, not all of the eight
thousand ASes that are missing from the CIDR report are
unused. There are a lot of ASes out there that are in use,
but don't show up on a global routing table. Most of these
are regional backbone or exchange ASes that don't themselves
terminate any routes. They are only visible to networks
that are connected to them.

  ...assuming, of course, that nobody transits those ASes to
  the rest of the Internet.

And then there's the RBL AS, 7777.

  Not to be confused with the AS that shall forever live in
  infamy, 7007. Anybody still filtering that one?

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In article <19981005230954.B3137@cp.net>,