how many BGP routers, how many ASes
Hi all, I have scouted around for this information, but not get very far. I'm hoping someone will have answers at hand. What I want to know is roughly how many : 1. ASes there are in the world today? 2. BGP routers there are, for intra-domain as well as inter-domain routing, in total in the world? 3. BGP routers do the largest ASes have? 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. An Internet source that provides the above information would be most useful - though I can't seem to find it with google. I'd be grateful for answer to be sent to me directly, whether you also post to NANOG is up to you. thanks in advance. irfan
Hi Irfan, Take a look at the Team Cymru page here: http://www.cymru.com/BGP/summary.html Thanks, John -----Original Message----- From: Irfan Zakiuddin [mailto:irfan.zakiuddin@googlemail.com] Sent: Wednesday, May 13, 2009 11:53 AM To: nanog@nanog.org Subject: how many BGP routers, how many ASes Hi all, I have scouted around for this information, but not get very far. I'm hoping someone will have answers at hand. What I want to know is roughly how many : 1. ASes there are in the world today? 2. BGP routers there are, for intra-domain as well as inter-domain routing, in total in the world? 3. BGP routers do the largest ASes have? 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. An Internet source that provides the above information would be most useful - though I can't seem to find it with google. I'd be grateful for answer to be sent to me directly, whether you also post to NANOG is up to you. thanks in advance. irfan
On May 13, 2009, at 11:53 AM, Irfan Zakiuddin wrote:
I have scouted around for this information, but not get very far. I'm hoping someone will have answers at hand.
You obviously didn't look very hard. The answer to the first question is posted to this very list every Friday: <http://www.cidr-report.org/as2.0/> The last two are probably not really knowable with any precision, but you might find some estimates. Although I'm not really sure what utility the number is. -- TTFN, patrick
What I want to know is roughly how many :
1. ASes there are in the world today? 2. BGP routers there are, for intra-domain as well as inter-domain routing, in total in the world? 3. BGP routers do the largest ASes have?
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.
An Internet source that provides the above information would be most useful - though I can't seem to find it with google.
I'd be grateful for answer to be sent to me directly, whether you also post to NANOG is up to you.
thanks in advance.
irfan
Irfan, This is sent weekly to the list: Routing Table Report 04:00 +10GMT Sat 09 May, 2009 Report Website: http://thyme.apnic.net Detailed Analysis: http://thyme.apnic.net/current/ Analysis Summary ---------------- BGP routing table entries examined: 288037 Prefixes after maximum aggregation: 136199 Deaggregation factor: 2.11 Unique aggregates announced to Internet: 140785 Total ASes present in the Internet Routing Table: 31199 Prefixes per ASN: 9.23 Origin-only ASes present in the Internet Routing Table: 27142 Origin ASes announcing only one prefix: 13239 Transit ASes present in the Internet Routing Table: 4057 Transit-only ASes present in the Internet Routing Table: 96 Average AS path length visible in the Internet Routing Table: 3.6 Max AS path length visible: 33 Max AS path prepend of ASN (43683) 31 Prefixes from unregistered ASNs in the Routing Table: 461 Unregistered ASNs in the Routing Table: 151 Number of 32-bit ASNs allocated by the RIRs: 142 Prefixes from 32-bit ASNs in the Routing Table: 30 Special use prefixes present in the Routing Table: 0 Prefixes being announced from unallocated address space: 194 Number of addresses announced to Internet: 2039977920 Equivalent to 121 /8s, 151 /16s and 151 /24s Percentage of available address space announced: 55.0 Percentage of allocated address space announced: 63.7 Percentage of available address space allocated: 86.4 Percentage of address space in use by end-sites: 76.9 Total number of prefixes smaller than registry allocations: 142407 On Wed, 2009-05-13 at 16:53 +0100, Irfan Zakiuddin wrote:
Hi all,
I have scouted around for this information, but not get very far. I'm hoping someone will have answers at hand.
What I want to know is roughly how many :
1. ASes there are in the world today? 2. BGP routers there are, for intra-domain as well as inter-domain routing, in total in the world? 3. BGP routers do the largest ASes have?
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.
An Internet source that provides the above information would be most useful - though I can't seem to find it with google.
I'd be grateful for answer to be sent to me directly, whether you also post to NANOG is up to you.
thanks in advance.
irfan -- "Prediction is very difficult, especially about the future." Niels Bohr -- Ray Sanders Linux Administrator Village Voice Media Office: 602-744-6547 Cell: 602-300-4344
On Wed, 13 May 2009 16:53:11 BST, Irfan Zakiuddin said:
1. ASes there are in the world today?
The weekly routing table summary posted here will give you a good approximation, but it does not include AS's that aren't announced on the public Internet. This may or may not be an issue, depending what you are doing with the numbers (for instance, allocated but not announced ASs may not matter if you're looking at BGP performance - but they *do* matter if you're trying to estimate a drop-dead date for 32-bit ASN deployment).
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. ASes there are in the world today?
Hi Irfan, A little over 31,000. See http://www.cidr-report.org/as2.0/
2. BGP routers there are, for intra-domain as well as inter-domain routing, 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. BGP 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 trend. Regards, Bill Herrin -- William D. Herrin ................ herrin@dirtside.com bill@herrin.us 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004
On 14/05/2009, at 5:46 AM, William Herrin wrote:
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.
How are you certain that there are fewer BGP routers than prefixes? At all my previous employers we have had more routers than prefixes we advertised to the global table (which is where you get your 290k number). -- Nathan Ward
you might want to have a look at: http://irl.cs.ucla.edu/topology --Ricardo On May 13, 2009, at 8:53 AM, Irfan Zakiuddin wrote:
Hi all,
I have scouted around for this information, but not get very far. I'm hoping someone will have answers at hand.
What I want to know is roughly how many :
1. ASes there are in the world today? 2. BGP routers there are, for intra-domain as well as inter-domain routing, in total in the world? 3. BGP routers do the largest ASes have?
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.
An Internet source that provides the above information would be most useful - though I can't seem to find it with google.
I'd be grateful for answer to be sent to me directly, whether you also post to NANOG is up to you.
thanks in advance.
irfan
Wow, wish *I* had a group of people willing to do my thesis paper research for me ..
participants (9)
-
Irfan Zakiuddin -
jamie rishaw -
John Stuppi (jstuppi) -
Nathan Ward -
Patrick W. Gilmore -
Ray Sanders -
Ricardo Oliveira -
Valdis.Kletnieks＠vt.edu -
William Herrin