<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Johannes,<div class=""><br class=""></div><div class="">Du meinst Route dampening? Mein letzter Stand war, dass es mittlerweile nicht mehr so verbreitet und auch heute auch nicht mehr wirklich Best Practice ist. Route dampening wurde ja damals zu einer Zeit eingeführt, als flapping insb. hinsichtlich CPU power auf Routern noch ein echtes Problem war. Mit modernen Routern ist das aber normalerweise nicht mehr so das Problem.</div><div class=""><br class=""></div><div class="">Frage in die Runde - verwendet hier jemand BGP dampening und ja mit welchen Parametern (penalty, supress limit, reuse limit, etc.)? Sehen eure Parameter zu Transits/Downstreams/Peers anders aus? Gibt es vielleicht bessere Alternativen zu bgp dampening?</div><div class=""><br class=""></div><div class="">Lg</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">Am 18.12.2020 um 12:41 schrieb Johannes Wagner <<a href="mailto:j.wagner@netplanet.at" class="">j.wagner@netplanet.at</a>>:</div><br class="Apple-interchange-newline"><div class="">
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<div style="direction: ltr;" class="">Hallo,</div>
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<div style="direction: ltr;" class="">es war ja nicht „ein Ausfall“ das waren viele Flaps und ich schätze nicht jeder hat das in der Config berücksichtigt.</div>
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<div style="direction: ltr;" class="">Liebe Grüße Johannes Wagner</div>
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<div id="divRplyFwdMsg" dir="ltr" class=""><font face="Calibri, sans-serif" class=""><b class="">Von:</b> atnog <<a href="mailto:atnog-bounces@atnog.at" class="">atnog-bounces@atnog.at</a>> im Auftrag von Dominic Schallert <<a href="mailto:ds@schallert.com" class="">ds@schallert.com</a>><br class="">
<b class="">Gesendet:</b> Freitag, Dezember 18, 2020 12:36<br class="">
<b class="">An:</b> <a href="mailto:atnog@atnog.at" class="">atnog@atnog.at</a><br class="">
<b class="">Betreff:</b> [atnog] VIX Outage
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Hallo Liste,
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<div class="">der VIX hatte offenbar kurz vor 12h00 einen gröberen Holperer. Es hat praktisch alle ISPs in AT betroffen. Hier in Vorarlberg waren zeitweise Magenta, A1 und weitere de-fakto komplett offline. Wobei es wohl primär an den Umschaltzeiten (z.B. BGP
ohne BFD?) gelegen haben dürfte, da ich schon davon ausgehe, dass es entsprechende Backup-Leitungen gibt.</div>
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<div class="">Ich denke man sollte sich an dieser Stelle schon mal die Frage stellen dürfen wie es sein kann, dass eine Störung an einem zentralen Punkt in AT praktisch alle ISPs in Österreich dermaßen runter ziehen kann?</div>
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<div class="">Lg</div>
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