Yup, though to be more correct, the shun commands are coming from the IDS sensor itself rather than the IDS Management Station. The sensor opens a telnet/SSH session to the FWSM and issues the commands as needed. Hope this helps.
errorMessage: name=errSystemError Device [PIX] IP  Version [2.2] not supported.
If so, this error message can be ignored. The reason it is printed is because version 4.0 sensors expect the version of PIX to be greater than 6.0. In the case of a FWSM, this message can be ignored. Version 5.0 of the IDS code will officially support FWSM code.
But yes, I have seen shuns to the FWSM work. Issue a 'sh shun' on the FWSm after an alarm has triggered a shun and you should see it listed.
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...
[toc:faq]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 and UDP are I...