[114494] in North American Network Operators' Group
Re: how many BGP routers, how many ASes
daemon@ATHENA.MIT.EDU (William Herrin)
Wed May 13 13:46:49 2009
In-Reply-To: <9ba19d20905130853p30599f2euf8a32840da91207e@mail.gmail.com>
Date: Wed, 13 May 2009 13:46:29 -0400
From: William Herrin <herrin-nanog@dirtside.com>
To: Irfan Zakiuddin <irfan.zakiuddin@googlemail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Wed, May 13, 2009 at 11:53 AM, Irfan Zakiuddin
<irfan.zakiuddin@googlemail.com> wrote:
> What I want to know is roughly how many :
>
> 1. =A0ASes there are in the world today?
Hi Irfan,
A little over 31,000. See http://www.cidr-report.org/as2.0/
> 2. =A0BGP routers there are, for intra-domain as well as inter-domain rou=
ting,
> in total in the world?
I know of no authoritative source for this information. I used 150k
for my estimate when I prepared
http://bill.herrin.us/network/bgpcost.html last year; that fell more
or less in the middle of the educated guesses I got here on nanog and
in the other places I asked.
Figure every AS must have at least one BGP router, the vast majority
will have at least two, many will have more than two, and at least
some will have more than 100. Figure also that there are fewer BGP
routers in use than there are prefixes in the table. Gives you a lower
bound of around 70k and an upper bound around 290k.
> 3. =A0BGP routers do the largest ASes have?
Decide what you mean by largest, identify which AS that is on the CIDR
report and then go ask them.
> Really interesting would then be to say either how fast the above numbers
> are growing, or to give estimates for what the answers to 1-3 will be in =
5
> years time.
http://www.potaroo.net/tools/asn32/
Figure 7 offers a handy graph from which you should be able to project a tr=
end.
Regards,
Bill Herrin
--=20
William D. Herrin ................ herrin@dirtside.com bill@herrin.us
3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
Falls Church, VA 22042-3004
