BGP Scalability Simulation

Moazzam Khan emoazzam at
Tue Sep 2 12:43:28 CDT 2008

Hi Ricardo,

Basically I want to measure the Convergence times and routing table sizes.
But I am not able to find a good topology of internet which I can utilize
for my experimentations. I am looking at GT-ITM, BRITE and IGen but don't
know what kind of abstraction they provide and if these topologies are
feasible to test the above mentioned parameters.

What challenges I can face if I want to measure all those parameters
convergence times ,table sizes , update count, signal sizes etc.


On Tue, Sep 2, 2008 at 1:35 PM, Ricardo Oliveira <rveloso at>wrote:

> Moazzam,
> Do you have something specific in mind you want to measure? e.g.
> convergence times, table size, update count, etc? the scope of your study
> seems to broad as you describe it..
> Cheers,
> --Ricardo
> On Sep 1, 2008, at 12:57 PM, Moazzam Khan wrote:
>  Thanks Stefan for your reply.
>> Basically the goal of this testing is to study the BGP scalability issues
>> in
>> the internet sometime in future lets say 10 years from now and try to find
>> out what problems it could face . I am trying to use ns2 as my simulation
>> environment.
>> Can you suggest how I can set up the envrionment for this kind of study
>> and
>> what parameters should I try to caputre.
>> Regards
>> MAK
>> On Mon, Sep 1, 2008 at 3:51 PM, Fouant, Stefan <Stefan.Fouant at
>> >wrote:
>>   Topology and setup of these kinds of tests largely depend on whether you
>>> are testing iBGP or eBGP. In my experience, eBGP testing is fairly
>>> straight
>>> forward as you are almost always testing reconvergence of the BGP
>>> next-hop.
>>> iBGP testing scenarios on the other hand can be quite a bit more complex
>>> as
>>> you may also be testing the reconvergence of the underlying IGP if the
>>> BGP
>>> next-hop remains unchanged. Can you describe your testing goals and
>>> environment in a bit more detail?
>>> Stefan Fouant
>>> Principal Network Engineer
>>> NeuStar, Inc. -
>>> GPG Key ID: 0xB5E3803D
>>> ----- Original Message -----
>>> From: Moazzam Khan <emoazzam at>
>>> To: nanog at <nanog at>
>>> Sent: Mon Sep 01 15:37:19 2008
>>> Subject: BGP Scalability Simulation
>>> Hi
>>> I am trying to simulate BGP for scalability testing. I have few queries.
>>> 1) What sort of topology I should try out ?
>>> 2) What parameters should I test?
>>> I am trying to simulate it in ns-2  and i would appreciate reply from you
>>> guys.
>>> Regards
>>> MAK

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