Cisco Bug: CSCsz51146 - TCP bad segment and sequence number in BGP raises CPU on SXI1 modular
Feb 23, 2018
- Cisco IOS
Known Affected Releases
Cisco WS-6509-Es running 12.2(33)SXI1 modular and BGP, gets into a state of receiving bad segment and sequence number from it's BGP peers. This raises the CPU on device significantly. MP_SW#sh proc cpu | ex 0.0 CPU utilization for five seconds: 58%/38%; one minute: 52%; five minutes: 60% PID 5Sec 1Min 5Min Process 1 0.1% 0.3% 0.5% kernel 24599 39.6% 34.5% 40.3% ios-base 24620 0.6% 0.3% 0.4% raw_ip.proc 24622 15.6% 13.6% 16.7% tcp.proc 24624 2.7% 3.6% 2.0% iprouting.iosproc Symptom: High CPU Conditions: Link flap or router reloads lead change in topology and trigger routing protocol update.
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