Follow this sequence to set up interfaces on AIM-IPS and the router:
1. Configure the IPS command and control interface on the router, and the AIM-IPS IP address, mask, and gateway using one of the following methods:
• An unnumbered IP address on the IDS-Sensor interface
Note Using an unnumbered IP address on the IDS-Sensor interface is the preferred method for configuring interfaces on the module and router.
• A routable IP address
• Default module IP address with NAT
• User-configured IP address with NAT
2. Enable the monitoring interface and specify whether it is promiscuous or inline, assign the ACL to the interface, specify how you want the router to handle traffic if the module fails, and create a monitoring ACL (optional).
3. Save the configuration.
For further information click this link.
http://www.cisco.com/en/US/docs/security/ips/6.0/configuration/guide/cli/cliAIM.html#wp1044068
