Preview Tool

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

Last Modified

Aug 13, 2017

Products (96)

  • Cisco IOS
  • Cisco 812 CiFi Integrated Services Router
  • Cisco 898 Secure G.SHDSL EFM/ATM with Multi-Mode 4G LTE ISR Router
  • Cisco 892W Integrated Services Router
  • Cisco C897VA Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco 888W Integrated Services Router
  • Cisco 2951 Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
  • Cisco 819 Hardened Integrated Services Router
View all products in Bug Search Tool Login Required

Known Affected Releases

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

Description (partial)

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

The layer 2 ISDN link has to flap to get into this condition.
Bug details contain sensitive information and therefore require a account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.