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Cisco Bug: CSCur07269 - QoS is causing alignment errors on MLPPP E1 interfaces

Last Modified

Oct 01, 2019

Products (96)

  • Cisco 1900 Series Integrated Services Routers
  • Cisco 1905 Serial Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 861W Integrated Services Router
  • Cisco 819 Hardened Integrated Services Router
  • Cisco 812 CiFi Integrated Services Router
  • Cisco 2951 Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco C897VA Integrated Services Router
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Known Affected Releases

15.3(3)M4 15.4(3)M

Description (partial)

Symptom:
QoS feature (service-policy input) is causing alignment errors that can be appreciated using 'show alignment' command.

Router#show alignment
C1900 Software (C1900-UNIVERSALK9-M), Version 15.4(3)M, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Compiled Mon 21-Jul-14 17:38 by prod_rel_team

Total Corrections 223306, Recorded 1, Reads 223306, Writes 0

 Initial	 Initial
 Address  Count	 Access Type   Traceback
 C1C6849  26698	 16bit read    0x211588A0z  0x2113EB80z	 0x21161800z  0x21146C70z
			       0x21149E30z  0x210D3B90z	 0x23CE0600z  0x214A76B4z

You may observe as well, a wrong order on the percentage of CPU, the first value should be the total of CPU and in the "show proc cpu sorted" output is shown in the other way. 

CPU utilization for five seconds: 22%/100%; one minute: 49%; five minutes: 38%
 PID Runtime(ms)     Invoked      uSecs   5Sec   1Min   5Min TTY Process 
  85      759400       65163      11653 21.85%  9.83%  6.04%   0 Per-Second Jobs  
   6      814748       12937      62978  0.17%  1.52%  1.58%   0 Check heaps      
 125       80924       60953       1327  0.08%  0.41%  0.32%   0 FHRP Main thread 
 119       62400      212895        293  0.08%  0.03%  0.10%   0 HWIC dsx IPC     
  58        2184          91      24000  0.08%  0.56%  0.35%   0 Exec             
 382       44232       15339       2883  0.08%  0.06%  0.38%   0 EIGRP-IPv4

Conditions:
The trigger seems to be QoS applied in MLPPP E1 interface.
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Bug Details Include

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