Once you configure interface vlan11 with proper nameif command I think it will take the command.
Make sure to issue "sh run int vlan11" and see that it is properly configured with ip address and nameif. FWSM does not have to be in production to be able to take this command. You don't even have to push the vlans down to the FWSM from the switch.
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...