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Cisco Bug: CSCuj59149 - IPSEC over TCP EzVPN traffic does not pass with ISM enabled on ISRG2

Last Modified

Feb 02, 2017

Products (74)

  • Cisco IOS
  • Cisco 812 CiFi Integrated Services Router
  • Cisco C892FSP Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
  • Cisco 886VA-CUBE Integrated Services Router
  • Cisco 819 Hardened Integrated Services Router
  • Cisco 2951 Integrated Services Router
  • Cisco 888W Integrated Services Router
  • Cisco 861W Integrated Services Router
  • Cisco 892W Integrated Services Router
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Known Affected Releases

15.3(3)M

Description (partial) 

Symptom:
If two ISRG2s running Cisco IOS Release 15.3.3M with ISM, establish an EzVPN tunnel using IPSEC over TCP, the tunnel comes up (ISAKMP and IPSEC) but traffic does not pass and on the receiver we get the following error:

%CRYPTO-4-RECVD_PKT_INV_SPI: decaps: rec'd IPS  acket has invalid spi

Conditions:
This symptom is observed in ISRG2 with ISM and running IPSEC over TCP for an EZVPN tunnel.
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