You need an IPSEC SPA to do encryption on the Catalyst 6500 switches.
Without a SPA-IPSEC-2G or IPsec VPN Acceleration Services Module, the IPsec Network Security feature (configured with the crypto ipsec command) is supported in software only for administrative connections to Catalyst 6500 series switches and Cisco 7600 series routers.
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...