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Cisco Bug: CSCun69607 - 4900M: High CPU when copying from FTP/TFTP to bootflash

Last Modified

Apr 05, 2017

Products (1)

  • Cisco Catalyst 4000 Series Switches

Known Affected Releases

12.2(52)SG 12.2(54)SG1 15.0(2)SG8.0.100 15.1(2)SG3.0.2 15.2(1)E

Description (partial)

Symptom:
When copying a file (i.e. an IOS image) from a remote server to bootflash via FTP/TFTP, high CPU is observed and various control-plane services may be impacted.

Examination of 'show process cpu sorted' indicates that the high CPU is at process level. It follows the method used to initiate the transfer. For example, if the transfer is initiated from a console connection, high CPU is seen under "Exec". If initiated via SSH, high CPU is seen under "SSH Process".

4900M#sh proc cpu sort
CPU utilization for five seconds: 96%/0%; one minute: 12%; five minutes: 6%
 PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process
   3      334682       74675       4481 84.22%  7.51%  1.58%   0 Exec
  76      126545      235517        537  7.25%  3.97%  3.64%   0 Cat4k Mgmt HiPri
 275         228        3016         75  1.97%  0.19%  0.04%   0 TFTP Read Proces

Conditions:
This has been observed on a 4900M running various available IOS releases. This includes, but is not limited to:

12.2(54)SG1
15.0(2)SG8
15.1(2)SG3
15.2(1)E1

No specific configuration appears to be required.
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