The Cidr Report

This is an auto-generated mail on Fri Jul 30 12:00:00 PDT 1999
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

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      A summary of the last weeks changes in terms of withdrawn and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 for giving me access to their routing tables once a

Please send any comments about this report directly to me.

Check for a daily
update of this report.

Erm, I know I posted about this a while back, but I think this is
potentially an important one. I haven't got a graphical browser just
now - so I cannot look at the graphs online - so this may be all
complete speculation, but can someone please extrapolate when we
will hit 2^16 routes in the general world ? Subtract a few week
window for local routes to push people over the 2^16 number and
then can we sit back and wonder how many routers / vendors / software
implementations will have some bug at that number ?

If I were being a millenial sceptic, I could hazard a guess at about
New Years Eve for that date ... :slight_smile:


Several promising local ISP's have local routing tables bigger than 2^16.
In fact, I suspect all the usual suspects are pushing more. I don't think
this is a major problem.