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Cisco Bug: CSCvs29535 - IWAN crash related to DCA channel

Last Modified

Aug 25, 2020

Products (14)

  • Cisco IOS
  • Cisco 4221 Integrated Services Router
  • Cisco ASR 1000 Series IOS XE SD-WAN
  • Cisco 4331 Integrated Services Router
  • Cisco ASR 1002-X Router
  • Cisco 4321 Integrated Services Router
  • Cisco ASR 1001-X Router
  • Cisco 4351 Integrated Services Router
  • Cisco ASR 1002-HX Router
  • Cisco ISR 4000 Series IOS XE SD-WAN
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Known Affected Releases


Description (partial)

With the IWAN DCA(Direct Cloud Access) configured, found that a software crash occurred when received an Unreachable TCA from a DCA channel, and the crash happened only once.

As the crash only happened once in Customer side, and according to the core file decoding and analysis, one trigger condition in theory is as below. With the IWAN DCA configured, there is an available DCA channel with more than three DCA TCs for different SaaS applications controlled on it, firstly MC receives a Performance TCA for TC1 and a Unreachable TCA for TC2 in 2s which is the TCA process delay time, then remove the TC1, later when MC receives a Unreachable TCA for TC3, the crash will be triggered.
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