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An AIM is not recognized by a Cisco 2600/3600/3700 series router
On Cisco 2600/3600/3700 series routers with an installed Advanced Integration Module (AIM), encryption may still be performed by the main processor instead of the AIM. The reason for this may be a hardware and software incompatibility issue, a badly seated AIM, a faulty AIM, or a hardware failure on the backplane.
The output of the show crypto engine config command is useful for determining the cause of the problem.
This is an example of the show crypto engine config command output with the incorrect Cisco IOS Software installed:
Router#show crypto engine config
crypto engine name: unknown crypto engine type: software serial number: 59E1C9F9 crypto engine state: installed crypto engine in slot: N/A
This is an example of a poorly seated AIM (all configuration hex values show 0):
Also check whether a Data Encryption Standard (DES) or a Triple Data Encryption Standard (3DES) image is loaded. The image name will include either "56i" for DES, or "k9" for 3DES. The following is an example of a DES image:
To verify that the card is now correctly detected issue the show crypto engine config command. The crypto engine type line should read hardware, and the Configuration field should contain valid hexadecimal numbers. The following is sample command output for a working AIM: