[ris-int] Fw: NCC#2004081420 [RIPE beacon request!]
Henk Uijterwaal (RIPE NCC) henk at ripe.net
Mon Aug 23 12:10:09 CEST 2004
On Mon, 16 Aug 2004, RIS wrote: > Hi guys, > > What do you think about the following request? It looks he is > asking to extend our anycast failover scenario to more RRCs. > > After discussing with him what kind of patterns he needs, we > can use same prefix or we can use one of the free Beacon Prefixes. Use one of the free ones. H. > > Arife > > ----- Begin forwarded message ----- > > Date: Fri, 13 Aug 2004 20:39:14 -0400 > From: "Hitesh Ballani" <hitesh at cs.cornell.edu> > To: <ris at ripe.net> > Subject: NCC#2004081420 RIPE beacon request! > Message-Id: <81224EA6DDA07C43BC7555E32401029E054219 at EXCHVS2.cs.cornell.edu> > > > Hello, > > I was wondering if you could spare a beacon for the following experiment: At > the moment, one of your beacons (195.80.233.0/24) at advertised from 2 > locations - LINX and AMS-IX. An interesting question is to study anycast > fail-over time from an end user perspective - i.e given that the > advertisement is withdrawn from AMS-IX at a particular instant, how long is > it before convergence is reached and packets from a node, which were earlier > being routed to AMS-IX, are routed to LINX. I tried running this experiment > from a bunch of nodes on Planetlab but I have not been able to locate any > node whose packets are routed to AMS-IX and so, I am never able to analyze > the convergence time (for that matter, even nodes in Netherlands have their > packets routed to LINX). Here, "packets being routed to LINX" implies that > periodic traceroutes from my Planetlab sites show so. This is important to me > as I am currently working an a proxy based deployment model for IP anycast > and so anycast failover time through BGP is critical for me (see > http://www.cs.cornell.edu/People/francis/pias.pdf > and > http://www.cs.cornell.edu/People/francis/pias/pias-worlds.pdf for details!). > As a matter of fact we are in the process of obtaining 3 /22 blocks from ARIN > for this very purpose - however, given the long drawn nature of that process, > I thought it would be nice if I could use your advertisement infrastructure > to answer some niggling questions which are critical for the success of our > proposal. > > I was wondering if it would be possible for me to get a beacon to be > advertised from more locations (ideally, from America(RRC08), Europe(a number > of locations), and Asia(RRC06)). While a beacon being advertised from 2 > locations would suffice for the above experiment, but advertisements from > more than 2 locations would allow me to look at other stuff such as - How > good is IP anycast at selecting nearby locations? Ideally, when a node sends > out a packet to a anycast location, it should be routed to the destination > which is closest - but with the policy based nature of BGP, it is not clear > if it does. Such an experiment would make more sense with greater number of > advertising locations. I tried determining answers to these questions using > the anycasted root servers and the servers belonging to the AS-112 project > but the hierarchical nature of their deployment prevents me from coming to > any conclusions. While the above description may sound as if I am looking for > just an end-user analysis, but I will also be looking at BGP updates for the > anycast prefix to determine if advertising a prefix from many locations has > an adverse impact on the visibility of the prefix due to reasons such as > route flap dampening. > > If the above description sounds terribly confusing, I will be glad to provide > additional details about the experiments I plan to run. Also, if such an > arrangement is possible, I will plan out the detailed A/W pattern and the > sites involved. > > Thanks, > Hitesh > ------ End forwarded message ------ > ------------------------------------------------------------------------------ Henk Uijterwaal Email: henk.uijterwaal(at)ripe.net RIPE Network Coordination Centre http://www.amsterdamned.org/~henk P.O.Box 10096 Singel 258 Phone: +31.20.5354414 1001 EB Amsterdam 1016 AB Amsterdam Fax: +31.20.5354445 The Netherlands The Netherlands Mobile: +31.6.55861746 ------------------------------------------------------------------------------ Process and Procedure are the last hiding place of people without the wit and wisdom to do their job properly. (David Brent).
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