05-21-2007 03:43 AM - edited 03-05-2019 04:11 PM
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.
05-21-2007 08:15 AM
could be something like this.
CSCeg49196 Bug Details
Headline Excessive Overruns and lbusDrops due heavy flow control over fabric
Product IOS
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
Release Notes
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
condition include:
- overruns on almost all active interfaces
- lbusDrops associated with the supervisor slot (seen via "show fabric channel-
counters")
- 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"
command.
Workaround:
Reduce the amount of traffic flowing through the switch, particularity on
interfaces seeing the most overruns.
05-21-2007 09:04 AM
Thanks Grant. The issue has to do with system backups across the core causing the port-channels to fail, so this is definitely on the right track. It affects the 6724 and 6748 modules.
This was helpful! Thanks again.
Dennis.
05-21-2007 11:58 AM
CSCeg49196 Bug Details states it was 'First Fixed-in Version .... 12.2(18)SXD04, but Dennis' version is 12.2(18)SXF5.
Does that mean Dennis' problem may be related to something else?
05-21-2007 02:18 PM
SXF is a different train than sxd, if you look at the affected versions of this problem his IOS version was on the affected list so its possible it could affect him .
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