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Cisco Bug: CSCvs13960 - IWAN High CPU and Memory

Last Modified

Sep 02, 2020

Products (33)

  • Cisco IOS
  • Cisco Catalyst 9300-48P-A Switch
  • Cisco Catalyst 9300-48UN-A Switch
  • Cisco Catalyst 9300-48U-A Switch
  • Cisco Catalyst 9300-48UXM-A Switch
  • Cisco Catalyst 9300-48T-A Switch
  • Cisco Catalyst 9800-40 Wireless Controller
  • Cisco Catalyst C9500-16X-E Switch
  • Cisco Catalyst C9500-40X-A Switch
  • Cisco Catalyst 9300-48P-E Switch
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Known Affected Releases

15.5(3)S7.31 16.10.1

Description (partial)

Symptom:
High CPU and Memory associated with IWAN:

show processes cpu
CPU utilization for five seconds: 100%/0%; one minute: 99%; five minutes: 100%
 PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process
 280   229843513    32023786       7177 96.26% 96.53% 96.61%   0 CENT_COMMUNICATI


show processes memory sorted
Processor Pool Total: 1217787352 Used: 1051054160 Free:  166733192
 lsmpi_io Pool Total:    6295128 Used:    6294296 Free:        832

 PID TTY  Allocated      Freed    Holding    Getbufs    Retbufs Process
 676   0 213347675576 196457116664  406003592          0          0 CENT-BR-0       

------------- Top 100 allocator pc summary -----------

Tracekey : 1#8645af07f7f38c914a930de4d4982dcc   


Allocator PC Summary for: Processor

   Total      Count     Name               PC
277709344    8274  CENT_BR_MSG_BUF        :55683F9F4000+869C350	
103935048    2998  CENT_BR_MSG_CHU        :55683F9F4000+869C2E3	
 95736144    1686  CENT-BR-0              :55683F9F4000+4B8AE54

Conditions:
0, It's a day-one issue.
1, This issue is specific to routing platforms with IWAN enabled,
2, This issue happens most likely on hub or transit hub,
3, It's triggered by unstable networking environment (quick state flapping of interface).
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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  • Known Fixed Releases
  • Related Community Discussions
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