North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: BGP Scalability Simulation
Hi Ricardo, I checked the topologies from bgp tables at ucla site. These are in the form of huge tables . Can you please guide me how this can be utilized in the simulations. Regards MAK On Tue, Sep 2, 2008 at 2:04 PM, Ricardo Oliveira <[email protected]>wrote: > The topos you mentioned are synthetic (e.g. generated based on math), you > might want to check these ones instead, based on bgp tables from public > sources: > http://irl.cs.ucla.edu/topology/ > > Also, i don't think using a full internet topology is the way to go to do > measure convergence time. The reason is that convergence time is highly > dependent on ibgp architecture, router timers, etc and modeling things as > one router per AS is at most unrealistic for this purpose. I would suggest > to look at a small yet realistic topology of a few ISPs, e.g. as given by > rocket fuel: > http://www.cs.washington.edu/research/networking/rocketfuel/ > > For routing table size, you just need to grab the existing available > routing tables, e.g. > http://www.routeviews.org/ > and do an extrapolation of the number of prefixes in RIB n years from now > > --Ricardo > > > > > On Sep 2, 2008, at 10:43 AM, Moazzam Khan wrote: > > 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. >> >> >> Regards >> Moazzam >> >> On Tue, Sep 2, 2008 at 1:35 PM, Ricardo Oliveira <[email protected]> >> 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 <[email protected] >> >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. - http://www.neustar.biz >> GPG Key ID: 0xB5E3803D >> >> >> ----- Original Message ----- >> From: Moazzam Khan <[email protected]> >> To: [email protected] <[email protected]> >> 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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