If I understand your question correctly, you have an IPS appliance, like a 4200 series appliance that you want to connect to your 6500/7600 switch. This is pretty easy: Create an interface on your switch in each of the two VLANs, cable these to your IPS sensor, configure your sensor for these two as "interface pairs" and you should be good to go.
If you want some traffic reliability on top of this, add two additional interfaces, one in each VALN, cable them together, make sure Spanning Tree Protocol is running on these VLANs and make the STP metric of this interface higher than the default interface of the IPS connection. This will provide a "fail-open" patch for your traffic when the sensor dies, reloads or stops passing layer 2 traffic.
- Bob
