Hi, just for the record:
Ben Steele schrieb: > None of your neighbors are flapping or at least their route tables? No. > could be BGP RIB tables constantly being updated by unstable peer, > check to see if any have excessive updates, is the router meshed with > any others via iBGP? Yes an iBGP-mesh. The cause seems to be that this router constantly (every 0.1 second) withdraws 1 prefix (lets say x.x.x.x/19 - wich doesn't originate from our AS or our customers but is learned via eBGP) - it generates updates to all iBGP and eBGP-Peers (these are filtered of course): Feb 25 10:29:31.098 MET: BGP(0): Revise route installing 1 of 1 routes for x.x.x.x/19 -> a.a.a.49(main) to main IP table Feb 25 10:29:31.098 MET: BGP(0): updgrp 1 - z.z.z.z updates replicated for neighbors: ... Feb 25 10:29:31.098 MET: BGP(0): z.z.z.z send unreachable x.x.x.x/19 Feb 25 10:29:31.098 MET: BGP(0): z.z.z.z send UPDATE x.x.x.x/19 -- unreachable Feb 25 10:29:31.098 MET: BGP(0): updgrp 2 - a.a.a.49 updates replicated for neighbors: ... Feb 25 10:29:31.198 MET: BGP(0): Revise route installing 1 of 1 routes for x.x.x.x/19 -> a.a.a.49(main) to main IP table show ip bgp x.x.x.x/19 shows: BGP routing table entry for x.x.x.x/19, version 267318576 Paths: (2 available, best #2, table Default-IP-Routing-Table - next-hop mismatch) Flag: 0x820 Not advertised to any peer A B C, (aggregated by C z.z.z.z) w.w.68.89 from w.w.68.89 (w.w.69.124) Origin IGP, localpref 100, valid, external, atomic-aggregate D C, (aggregated by C z.z.z.z) a.a.a.49 (metric 161280) from a.a.a.49 (a.a.a.51) Origin IGP, metric 0, localpref 100, valid, internal, atomic-aggregate, best A collegue of mine is further investigating this under a new subject on this list ('BGP question') to discover the cause for this 'next-hop mismatch'. Thanks Hauke Krull -- Dipl.-Phys. Hauke Krull NetUSE AG Dr.-Hell-Straße 6 D-24107 Kiel Tel: +49 431 2390 400 Fax: +49 431 2390 499 http://www.NetUSE.DE/ Vorstand: Andreas Seeger (Vorsitz), Dr. Roland Kaltefleiter, Dr. Joerg Posewang Aufsichtsrat: Detlev Huebner (Vorsitz) Sitz der AG: Kiel, HRB 5358 USt.ID: DE156073942 Diese E-Mail enthaelt vertrauliche oder rechtlich geschuetzte Informationen. Das unbefugte Kopieren dieser E-Mail oder die unbefugte Weitergabe der enthaltenen Informationen ist nicht gestattet. The information contained in this message is confidential or protected by law. Any unauthorised copying of this message or unauthorised distribution of the information contained herein is prohibited. _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/