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A Catalyst 9000 series switch running IOS-XE may crash in the sessmgrd process.
Congestion internal to the switch while upgrading may result in IPC exhaustion. This may be due to an unsupported scale of the switch in question.
The crash has only been observed during the upgrade. Once the system is upgraded it remains stable due to the issue described here.
Too much churn is leading to CPU spike which is clogging IPC channels leading to memory exhaustion in low end platforms like C9200.
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