RE: What is a reasonable range for global BGP table size?
That number is still too high since some people are advertising their /25 to /32 prefixes to the route-views box.. Kris
-----Original Message----- From: Jared Mauch [mailto:jared@puck.Nether.net] Sent: Thursday, July 18, 2002 12:47 PM To: Robert Boyle Cc: nanog@merit.edu Subject: Re: What is a reasonable range for global BGP table size?
I was going off my data analysis of route-views data.
wc -l oix.home_as.out 135949 oix.home_as.out
this file has prefix:home_asn
(where home_asn is the last asn in the as_path. prefixes with inconsistent home_as will appear twice. this may be cause of some of your confusion. eliminating those brings it to 120131 prefixes)
- jared
On Thu, Jul 18, 2002 at 12:37:09PM -0400, Robert Boyle wrote:
At 11:26 AM 7/18/2002 -0400, you wrote:
Hmm.
We don't filter, and
112942 network entries and 391859 paths using 25288182
bytes of memory
We don't filter either and...
117800 network entries and 339843 paths using 23660948
bytes of memory
"about 135k prefixes last i checked." is not what we see
here from any of
our upstreams.
-Robert
Tellurian Networks - The Ultimate Internet Connection http://www.tellurian.com | 888-TELLURIAN | 973-300-9211 "Good will, like a good name, is got by many actions, and lost by one." - Francis Jeffrey
-- Jared Mauch | pgp key available via finger from jared@puck.nether.net clue++; | http://puck.nether.net/~jared/ My statements are only mine.
On Thu, Jul 18, 2002 at 11:11:18AM -0600, Kris Foster wrote:
That number is still too high since some people are advertising their /25 to /32 prefixes to the route-views box..
true, but unless you do ingress filtering of your upstream (which most smaller ASes do not do) your numbers may be wrong. People also leak internal routes to route-views at times also i've noticed. (still talking about the same route-views snapshot) count netmask % cut -d: -f2 oix.home_as.out | cut -d/ -f2 | sort -n | uniq -c 25 8 6 9 7 10 12 11 36 12 99 13 269 14 514 15 9764 16 1537 17 2778 18 8378 19 8131 20 6075 21 9949 22 12258 23 73921 24 468 25 419 26 354 27 378 28 241 29 225 30 105 32 - jared
Kris
-----Original Message----- From: Jared Mauch [mailto:jared@puck.Nether.net] Sent: Thursday, July 18, 2002 12:47 PM To: Robert Boyle Cc: nanog@merit.edu Subject: Re: What is a reasonable range for global BGP table size?
I was going off my data analysis of route-views data.
wc -l oix.home_as.out 135949 oix.home_as.out
this file has prefix:home_asn
(where home_asn is the last asn in the as_path. prefixes with inconsistent home_as will appear twice. this may be cause of some of your confusion. eliminating those brings it to 120131 prefixes)
- jared
On Thu, Jul 18, 2002 at 12:37:09PM -0400, Robert Boyle wrote:
At 11:26 AM 7/18/2002 -0400, you wrote:
Hmm.
We don't filter, and
112942 network entries and 391859 paths using 25288182
bytes of memory
We don't filter either and...
117800 network entries and 339843 paths using 23660948
bytes of memory
"about 135k prefixes last i checked." is not what we see
here from any of
our upstreams.
-Robert
Tellurian Networks - The Ultimate Internet Connection http://www.tellurian.com | 888-TELLURIAN | 973-300-9211 "Good will, like a good name, is got by many actions, and lost by one." - Francis Jeffrey
-- Jared Mauch | pgp key available via finger from jared@puck.nether.net clue++; | http://puck.nether.net/~jared/ My statements are only mine.
-- Jared Mauch | pgp key available via finger from jared@puck.nether.net clue++; | http://puck.nether.net/~jared/ My statements are only mine.
I still don't see where the excess 20K routes come from. Could these be internal routes from an iBGP ? BTW, we have similar histograms plotted on http://www.multicasttech.com/status/cidr.html and given in http://www.multicasttech.com/status/histogram.cidr.bgp # cidr_histogram Unicast Prefix Size Histogram # cidr_histogram Prefix Size | Number of Prefixes | Number of CIDR Holes | Number of Addresses | followed by relative PER CENTAGE in order # cidr_histogram size # prfx # holes # addr % prfx % holes % addr # cidr_histogram cidr_histogram 1 0 0 0 0.0 0.0 0.0 cidr_histogram 2 0 0 0 0.0 0.0 0.0 cidr_histogram 3 0 0 0 0.0 0.0 0.0 cidr_histogram 4 0 0 0 0.0 0.0 0.0 cidr_histogram 5 0 0 0 0.0 0.0 0.0 cidr_histogram 6 0 0 0 0.0 0.0 0.0 cidr_histogram 7 0 0 0 0.0 0.0 0.0 cidr_histogram 8 20 3 335544280 0.0 0.0 28.0 cidr_histogram 9 6 1 50331636 0.0 0.0 4.2 cidr_histogram 10 7 2 29360114 0.0 0.0 2.5 cidr_histogram 11 12 1 25165800 0.0 0.0 2.1 cidr_histogram 12 36 12 37748664 0.0 0.0 3.2 cidr_histogram 13 87 28 45612882 0.1 0.0 3.8 cidr_histogram 14 235 59 61603370 0.2 0.1 5.1 cidr_histogram 15 415 102 54394050 0.4 0.2 4.5 cidr_histogram 16 7270 851 476432180 6.4 1.4 39.8 cidr_histogram 17 1452 475 47576232 1.3 0.8 4.0 cidr_histogram 18 2647 846 43363154 2.3 1.4 3.6 cidr_histogram 19 7672 2205 62833680 6.8 3.7 5.2 cidr_histogram 20 7429 2680 30414326 6.6 4.5 2.5 cidr_histogram 21 5212 3146 10663752 4.6 5.3 0.9 cidr_histogram 22 7929 5330 8103438 7.0 9.0 0.7 cidr_histogram 23 9682 6619 4937820 8.6 11.2 0.4 cidr_histogram 24 62823 36537 15957042 55.5 61.8 1.3 cidr_histogram 25 54 51 6804 0.0 0.1 0.0 cidr_histogram 26 25 23 1550 0.0 0.0 0.0 cidr_histogram 27 31 31 930 0.0 0.1 0.0 cidr_histogram 28 30 28 420 0.0 0.0 0.0 cidr_histogram 29 16 16 96 0.0 0.0 0.0 cidr_histogram 30 79 76 158 0.1 0.1 0.0 cidr_histogram 32 31 29 31 0.0 0.0 0.0 Note that you (or route views) sees 10K more /24 than we do, 3K more /23's, etc. Regards Marshall Jared Mauch wrote:
On Thu, Jul 18, 2002 at 11:11:18AM -0600, Kris Foster wrote:
That number is still too high since some people are advertising their /25 to /32 prefixes to the route-views box..
true, but unless you do ingress filtering of your upstream (which most smaller ASes do not do) your numbers may be wrong. People also leak internal routes to route-views at times also i've noticed.
(still talking about the same route-views snapshot)
count netmask % cut -d: -f2 oix.home_as.out | cut -d/ -f2 | sort -n | uniq -c 25 8 6 9 7 10 12 11 36 12 99 13 269 14 514 15 9764 16 1537 17 2778 18 8378 19 8131 20 6075 21 9949 22 12258 23 73921 24 468 25 419 26 354 27 378 28 241 29 225 30 105 32
- jared
Kris
-----Original Message----- From: Jared Mauch [mailto:jared@puck.Nether.net] Sent: Thursday, July 18, 2002 12:47 PM To: Robert Boyle Cc: nanog@merit.edu Subject: Re: What is a reasonable range for global BGP table size?
I was going off my data analysis of route-views data.
wc -l oix.home_as.out 135949 oix.home_as.out
this file has prefix:home_asn
(where home_asn is the last asn in the as_path. prefixes with inconsistent home_as will appear twice. this may be cause of some of your confusion. eliminating those brings it to 120131 prefixes)
- jared
On Thu, Jul 18, 2002 at 12:37:09PM -0400, Robert Boyle wrote:
At 11:26 AM 7/18/2002 -0400, you wrote:
Hmm.
We don't filter, and
112942 network entries and 391859 paths using 25288182
bytes of memory
We don't filter either and...
117800 network entries and 339843 paths using 23660948
bytes of memory
"about 135k prefixes last i checked." is not what we see
here from any of
our upstreams.
-Robert
Tellurian Networks - The Ultimate Internet Connection http://www.tellurian.com | 888-TELLURIAN | 973-300-9211 "Good will, like a good name, is got by many actions, and
lost by one." -
Francis Jeffrey
-- Jared Mauch | pgp key available via finger from jared@puck.nether.net clue++; | http://puck.nether.net/~jared/ My statements are only mine.
-- Regards Marshall Eubanks This e-mail may contain confidential and proprietary information of Multicast Technologies, Inc, subject to Non-Disclosure Agreements T.M. Eubanks Multicast Technologies, Inc 10301 Democracy Lane, Suite 410 Fairfax, Virginia 22030 Phone : 703-293-9624 Fax : 703-293-9609 e-mail : tme@multicasttech.com http://www.multicasttech.com Test your network for multicast : http://www.multicasttech.com/mt/ Status of Multicast on the Web : http://www.multicasttech.com/status/index.html
On Thursday, July 18, 2002, at 05:25 , Marshall Eubanks wrote:
I still don't see where the excess 20K routes come from. Could these be internal routes from an iBGP ?
The export policy of contributors to route-views collectors is not well-defined. While some participants might be sending a customer or peer view, others are quite likely including all kinds of deaggregated bloat which only has intra-AS application, and that would never normally be seen by a peer AS. Joe
participants (4)
-
Jared Mauch -
Joe Abley -
Kris Foster -
Marshall Eubanks