I'm having a problem with port-channels failing between two 6513 chassis with sup 720s and the 6724-SFP line cards in high throughput situations. The IOS is 12.2(18)SFX5. Has anyone else ever encountered such issues? If so, what was the resoution. Thanks! Dennis.
Headline Excessive Overruns and lbusDrops due heavy flow control over fabric
Feature OTHERS Components Duplicate of
Severity 1 Severity help Status Resolved Status help
First Found-in Version 12.2(17d)SXB02 All affected versions First Fixed-in Version 8.5(0.21)JAC, 8.4(1.19), 8.6(0.51)TAL, 8.4(1.21), 12.2(17d)SXB07, 8.4(1.43), 8.4(1.45), 8.5(0.44)JAC, 8.6(0.69)TAL, 8.4(0.61)RCC05, 12.2(18)SXD04 Version help
A Sup720 system where the majority of modules are of type WS-X67xx may
experience system traffic flow degradation under certain traffic profiles,
typically meshed communication among hosts connected to all modules in the
system plus many-to-one type of communications. The symptoms seen during this
- overruns on almost all active interfaces
- lbusDrops associated with the supervisor slot (seen via "show fabric channel-
- TestMacNotification test failed messages seen repeatedly via "show log" for
modules with DFC's installed
- ports leaving and re-joining an EtherChannel
- Routing protocol flaps (hsrp, ospf ...)
- line protocol for multiple interfaces going down
Typically the time interval between occurrences of the problem fluctuates
greatly. During the problem overall PPS (packets-per-second) performance is
drastically reduced through the system as seen via the "show mls statistics"
Reduce the amount of traffic flowing through the switch, particularity on
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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