[c-nsp] OT - BGP Analysis

[Paul Stewart]

Thanks Justin... I didn't think there was an "open source solution" for
the big commercial offerings but thought it was worthwhile asking...

I'm in the process of taking our netflow data and analyzing some of the
bigger AS's and hopefully make an "educated guess" on how our traffic
will look... ;)

Paul
 

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Justin M.
Streiner
Sent: Monday, October 16, 2006 2:14 PM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] OT - BGP Analysis

On Mon, 16 Oct 2006, Paul Stewart wrote:

> Does anyone know of any tools that would allow us to analyse our BGP 
> traffic to answer the question of "if we switched to Provider X and we

> kept Provider Y & Z, X Mb/s of traffic would flow via Provider X" ??

Any commercial products I've seen come with that commercial price tag,
as you've already seen.  There are freeware tools that will accept
Netflow data from your border routers and produce nice graphs of traffic
by protocol, destination, etc.  Some also let you produce reports based
on some subset of your existing netflow data.  Some of the better / more
widely used freeware Netflow tools are (in no special order):
* nfsen / nfdump
* flow-tools
* FlowScan
* Stager

A nice list of Netflow tools can be found here:
http://www.switch.ch/tf-tant/floma/software.html

The other thing to keep in mind is that the exact amount of traffic you
will send to destination X using path Y is subject to some amount of
variability, often stemming from topology changes outside of your little
piece of the Internet that are totally beyond your control.  I'm also
assuming that you're taking reasonably full BGP feeds from your
upstreams to allow for more granular control over your routing
decisions.

jms
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