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Cisco Bug: CSCut62590 - IKEv2 INVALID_KE_PAYLOAD should not be sent when IPSec mode mismatch

Last Modified

Mar 13, 2018

Products (96)

  • Cisco IOS
  • Cisco C892FSP Integrated Services Router
  • Cisco 898 Secure G.SHDSL EFM/ATM with Multi-Mode 4G LTE ISR Router
  • Cisco VG204XM Analog Voice Gateway
  • Cisco C897VA Integrated Services Router
  • Cisco 892W Integrated Services Router
  • Cisco 1905 Serial Integrated Services Router
  • Cisco 812 CiFi Integrated Services Router
  • Cisco 886VAG 3G Integrated Services Router
  • Cisco 861W Integrated Services Router
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Known Affected Releases

15.4(3)M 15.5(2.10)T

Description (partial)

Symptom:
A rekey fails with a reason "%IKEV2-3-NEG_ABORT: Negotiation aborted due to ERROR: Unsupported DH group" even that the root cause is mismatched IPSec mode.

The message is misleading and should be fixed

Conditions:
On one end - 2xproposals, one using transport and the other tunnel mode
On the other end - a proposal with tunnel mode.

In IKEv2 "Notify Message Type: USE_TRANSPORT_MODE " applies to all proposals. In other words both proposals will use transport mode.
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Bug Details Include

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