[c-nsp] OT - BGP Analysis

[Sam Stickland]

Paul Stewart wrote:
> Hi there... sorry for the OT post... but figured that there would a
> number of people on this list with ideas..;)
>
> 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" ??
>
>   
Maybe you seek C-BGP? http://cbgp.info.ucl.ac.be/

"/C-BGP/ is an efficient BGP routing solver. Its aim is to compute the 
outcome of the BGP decision process in network topologies composed of 
several routers. The BGP model implemented in /C-BGP/ is not hindered by 
the transmission of BGP messages over simulated TCP connections as in 
/SSFNet/ or /J-Sim/. The solver supports the complete BGP decision 
process, versatile import and export filters, route-reflection, and 
experimental attributes such as redistribution communities. It is easily 
configurable through a CISCO-like command-line interface. /C-BGP/ does 
not model session establishment and timers (MRAI, dampening, ...). A 
paper describing parts of /C-BGP/ has been published in IEEE Network 
magazine: "Modeling the Routing of an Autonomous System with C-BGP" 
<http://cbgp.info.ucl.ac.be/#paper_cbgp> (please refer to this paper 
when you cite /C-BGP/).

/C-BGP/ can be used to experiment with modified decision processes and 
additional BGP attributes. It can also be used to evaluate the impact of 
input/output policies on the routing tables of other ASes. Thanks to its 
efficiency, it can be used with large topologies with sizes of the same 
order of magnitude than the Internet. For the moment, we mainly use it 
to study interdomain traffic engineering techniques and to model the 
network of ISPs."