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Cisco Bug: CSCur47123 - VPN-ISM: Stops encrypting/decrypting traffic over IPSec tunnel w/fvrf

Last Modified

Sep 14, 2019

Products (113)

  • Cisco IOS
  • Cisco 892W Integrated Services Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco 812 CiFi Integrated Services Router
  • Cisco 819 Hardened Integrated Services Router
  • Cisco C897VA Integrated Services Router
  • Cisco 898 Secure G.SHDSL EFM/ATM with Multi-Mode 4G LTE ISR Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco C892FSP Integrated Services Router
  • Cisco 2951 Integrated Services Router
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Known Affected Releases

15.2(4)M6 15.4(3)M

Description (partial)

On 15.2(4)M6a, 15.4(3)M & 15.2(4)M7 packets stop encrypting/decrypting on the router using the ISM module with Front Door VRF configured. No packets are encrypted/decrypted over this tunnel with ISM module in active state and FVRF in place.
No drops to be seen under 'show crypto eng accel stat' or due to CEF (as per the CEF debugs). Debugs for IP packet looks fine too.

-ISM Module is active and FVRF configuration is in place.
-Crypto-map/TP based IPSec tunnel.
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