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Cisco Bug: CSCvt99272 - High CPU usage caused by "TCP Timer" process

Last Modified

Jun 25, 2020

Products (1)

  • Cisco IOS

Known Affected Releases

16.6.6 16.6.7

Description (partial)

"TCP Timer" process is causing high CPU usage

* scaled setup with hundreds of TCP sessions (for example BGP peers)
* sessions are almost immediately torn down and end up in FINWAIT1 state (show tcp brief | include FINWAIT1)
* device is not receiving ACKs from hosts due to forwarding issues (for example drops on the path)
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