The Ironport is not aware of failover. It is only aware of traffic being sent to it.
The setup should have the switches trunked to each other, so that traffic will pass either switch, to either ASA that is active, and then on to whichever the WCCP protocol chooses as Ironport to forward the traffic to.
Whichever ASA is active in a failover setup, will use the configuration of WCCP, which handles how the traffic is forward to the Ironports configured in the WCCP process.
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...