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Cisco Bug: CSCuq20562 - ISDN Memory Leak when PRI link flaps, crashes Router

Last Modified

Sep 18, 2018

Products (215)

  • Cisco IOS
  • Cisco Catalyst 3850-12S-E Switch
  • Cisco Catalyst 3650-12X48UQ-L Switch
  • Cisco Catalyst 3850-48XS-F-S Switch
  • Cisco Catalyst 3650-48FQ-E Switch
  • Cisco 2951 Integrated Services Router
  • Cisco Catalyst 3650-24TD-S Switch
  • Cisco Catalyst 3850-32XS-E Switch
  • Cisco 1905 Serial Integrated Services Router
  • Cisco Catalyst 3650-48FQM-L Switch
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Known Affected Releases

15.4(2.1)T 15.4(3)M Denali-16.3.3

Description (partial)

Symptom:
ISDN Layer 2 reserves memory consistently while there is a link flap, which eventually consumes the ISDN memory over time and might cause a crash of the Router. You will see the following errors getting printed in the logs:
%ISDN-1-NOMEMORY: no memory for L3_Init_NLCB: Timer block failure
%ISDN-1-NOMEMORY: no memory for L3_GetNew_NLCB: couldn't allocate memory

Conditions:
The layer 2 ISDN link has to flap to get into this condition.
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Bug Details Include

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