This may well be true. Not long ago I had another very busy 6500 not being able to respond to UDLD packets with the result that some of its neighbors errordisabled the links.
-Jens >Just a quick thought - if some other process is chewing the cpu to the point >where it stops normal stp behaviour, might that be causing the loop? >In other words, perhaps loops are the effect, not the cause? >On 2 September 2010 07:04, Jens S Andersen <[email protected]> wrote: >> Hi Peter >> >> The router is doing layer2 and 3. (OSPF, HSRP, PVST) >> The router is totally unresponsive, even after the loop is broken (by >> shutting >> an interface on the neighbour-router). >> Power off helps..... >> >> Logging on to the other routers is difficult/impossible because they are >> overloaded. Would a scheuler allocate make any difference here? >> >> All I can see in the logfiles is host/address-flapping and storm-control >> kicking >> in. >> >> Jens >> >> >On Wed, 2010-09-01 at 16:26 +0200, Jens S Andersen wrote: >> >> 2 weeks ago i upgraded my WS-C6503-E/WS-SUP32-GE-3B to ios >> >> advipservicesk9_wan-mz.122-33.SXI4a. >> >> >> >> Since then I've seen 2 cases of layer 2 loop. This switch/router forms >> >> a layer 2 "ring" with 3 other switch/routers (for redundancy). This >> >> has ben working for years without problems. >> >> >> >> Has anyone experienced stability-problems with this IOS version? >> >> >Plain L2 switching with switchports? Or something more exotic? >> >> >What do the switches themselves say about it? Have you tried STP >> >debugging or been able to observe the problem while it happens? >> >> >I guess everybody's seen loops of some kind, but most times there's an >> >explanation. >> >> >-- >> >Peter >> >> >> >_______________________________________________ >> >cisco-nsp mailing list [email protected] >> >https://puck.nether.net/mailman/listinfo/cisco-nsp >> >archive at http://puck.nether.net/pipermail/cisco-nsp/ >> >> >> Jens S Andersen Email: [email protected] >> Aalborg University Telf: 9940 9464 >> Selma Lagerlöfs Vej 300, 4.2.59 Fax: 9940 7593 >> 9220 Aalborg >> Denmark >> _______________________________________________ >> cisco-nsp mailing list [email protected] >> https://puck.nether.net/mailman/listinfo/cisco-nsp >> archive at http://puck.nether.net/pipermail/cisco-nsp/ >> Jens S Andersen Email: [email protected] Aalborg University Telf: 9940 9464 Selma Lagerlöfs Vej 300, 4.2.59 Fax: 9940 7593 9220 Aalborg Denmark _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
