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[Fwd: Quagga question]
by Henk Uijterwaal 27 May '08

27 May '08

Hi RIS team, See below. Any comments or ideas? Olaf helped with us on myASn in the past, so we should say a little bit more than just a standard answer. Henk -------- Original Message -------- Subject: Quagga question Date: Tue, 27 May 2008 09:42:26 +0300 From: Olaf Maennel <olaf(a)maennel.net> To: Henk Uijterwaal <henk(a)ripe.net> CC: Ashley Flavel <ashley.flavel(a)adelaide.edu.au> Dear Henk, how are you? haven't heard from you for a while now... Hope everything is okay?! Ashley, one of my colleagues in Australia, was looking into errors in quagga and suspects that updates could sometimes be reordered if they arrive within a very short time (= not written to file in chronological order). Are you aware of anything like that? Thanks, olaf On 27/05/08 4:44 AM, "Ashley Flavel" <ashley.flavel(a)adelaide.edu.au> wrote: > Hi guys, > > I'm looking at making the CleanBGP stuff usable by others (including > myself). Just found an interesting 'feature' of the data. I'm not > sure if it is a bug in the Quagga route monitor collecting the data, > but this is what is happening... > > If two updates are received at the same timestamp for the same prefix, > I have been assuming that the ordering of them in the file dictates > which order they were received in. However, this is not necessarily > the case :( I have found cases where a prefix is updated twice in the > same second and the ordering of the updates is incorrect in the files > (I know this as I have tables which tell me the entry which is > present). It gets worse... I have also found cases where updates with > a gap of 1 second are recorded in the incorrect order. > > I have a way to deal with this... I keep a history of the last update > prior to the current update (if it is within 5 seconds -- I could make > this larger if I needed to). Then when I compare my constructed table > at a timestamp, if a difference occurs, I can check if this is as a > result of the ordering of 'almost simultaneous' updates. > > So... although this is annoying -- it also adds to the 'things you > need to be careful about' when analysing the data. > > Ash > -- ------------------------------------------------------------------------------ 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 ------------------------------------------------------------------------------ Is one of the choices leaving the office open? Alan Greenspan on the next elections

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vascularises
by Speno Houseman 13 Apr '08

13 Apr '08

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melilla
by McClusky Triece 12 Apr '08

12 Apr '08

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houseward
by Hespen Kotek 03 Apr '08

03 Apr '08

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valiant
by Biele Fittje 27 Mar '08

27 Mar '08

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befriends
by Lehoullier Teran 19 Mar '08

19 Mar '08

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syne
by Palfreyman Engblom 09 Mar '08

09 Mar '08

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ilion
by Torruellas Redig 09 Mar '08

09 Mar '08

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diverting
by Wiltjer Marnell 04 Mar '08

04 Mar '08

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RIS remote route collector at NOTA online
by Erik Romijn 25 Feb '08

25 Feb '08

[Apologies for duplicate e-mails] Dear Colleagues, The RIPE NCC is pleased to announce that the 15th Remote Route Collector (RRC) of the Routing Information Service (RIS) is now online at the NAP of the America's (NOTA) Internet exchange point in Miami. This RRC collects routing information from all exchange members willing to peer with us. We would like to thank Terremark Worldwide for their co-operation and extensive support during both the set-up and operation of this collector. Peering with RIS ---------------- Our AS Number is 12654 and our peering addresses at NOTA are 198.32.124.171 and 2001:478:124::171. If you would like to peer with us, please fill in the form at: http://www.ris.ripe.net/cgi-bin/peerreg.cgi For more information about peering with RIS, please see: http://www.ripe.net/projects/ris/docs/peering.html About the RIS ------------- The RIS aims to collect and store Border Gateway Protocol (BGP) routing information and make it publicly available for the Internet community. The RIS database and the RIS database tools can help network operators troubleshoot routing problems by providing eBGP data collected over time without being limited to a single BGP view. The RIS deploys RRCs at major Internet exchanges where they peer with other networks. At this moment, the RIS has over 600 peers on 16 different Internet exchanges. For more information, please see: http://www.ripe.net/ris/ If you have any further questions, please contact <ris(a)ripe.net>. Regards, Erik Romijn Information Services RIPE NCC

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