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Cisco Bug: CSCus30780 - Router crash with STACKLOW on configuring custom NBAR classifications

Last Modified

Feb 13, 2018

Products (96)

  • Cisco IOS
  • Cisco C897VA Integrated Services Router
  • Cisco 892W Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 898 Secure G.SHDSL EFM/ATM with Multi-Mode 4G LTE ISR Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco C892FSP Integrated Services Router
  • Cisco 861W Integrated Services Router
  • Cisco 819 Hardened Integrated Services Router
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Known Affected Releases


Description (partial)

A router will crash with a STACKLOW while configuring "ip nbar custom x" because the stack space of that process has been exhausted.

CMD: 'ip nbar custom <name> <protocol>  <#> <start#> <end#> 
%SYS-6-STACKLOW: Stack for process SNMP ConfCopyProc running low, 0/12000

In this case, NBAR was being configured via SNMP which is likely a victim. Hence, any process other than SNMP may show up on the stack during the crash.

"ip nbar custom" is being configured
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