We have seen this issue with IBM/BNT 8264 L3 switches. In troubleshooting we were informed by IBM that there was a bug in the code we were running at the time (I have forgotten waht version) regarding snmp causing cpu to spike to 100% and cause STP topology changes and once even a reboot of both core routing switches. Patched code has been applied but still cna't get management approval to turn polling (switches have been unmanaged) back on so I can't say if it is repaired or not.
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