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Cisco Bug: CSCut62708 - SYS-3-NOELEMENT: data_enqueue on C1900

Last Modified

Mar 09, 2018

Products (82)

  • Cisco IOS
  • Cisco 2951 Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco 888W Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 1905 Serial Integrated Services Router
  • Cisco 819 Hardened Integrated Services Router
  • Cisco C897VA Integrated Services Router
  • Cisco 892W Integrated Services Router
  • Cisco 861W Integrated Services Router
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Known Affected Releases

15.3(3)M4

Description (partial)

Symptom:
A Cisco 1900 router may send a %SYS-3-NOELEMENT message, similar to:

%SYS-3-NOELEMENT: data_enqueue:Ran out of buffer elements for enqueue -Process= "<interrupt level>"

After that, system behavior can be unpredictable. If the interrupts are rapid enough, the system may become unresponsive (hang), use all available memory to create more buffer elements.

Conditions:
The process has run out of buffer elements and is unable to enqueue data. 

These messages may occur if there is are more than 1000 state changes per second of flow control (RTS/CTS) or modem control (DSR/DTR) lead states, even if modem control or flow control are not configured. Usually, this is caused by a device that is malfunctioning or misconfigured. There is also a chance it could be caused by a faulty or loose cable.
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