You should check if the high CPU utilization is seen only with IDS enabled or is that the case even when IDS is disabled. If the latter is true, bug CSCdx50230 might be the source. It talks about high CPU utilization on the 7200 with certain IOS versions. You might also want to refer to the document on troubleshooting high CPU utilization at http://www.cisco.com/warp/public/63/highcpu.html
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...