I have a Cat4006 Sup-III with the following as a show version:
Cisco Internetwork Operating System Software
IOS (tm) Catalyst 4000 L3 Switch Software (cat4000-IS-M), Version 12.1(8a)EW1, E
ARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
TAC Support: http://www.cisco.com/tac
Copyright (c) 1986-2002 by cisco Systems, Inc.
Compiled Wed 20-Feb-02 18:02 by eaarmas
Image text-base: 0x00000000, data-base: 0x00AA30DC
ROM: 12.1(11br)EW
uptime is 5 weeks, 3 days, 23 hours, 27 minutes
System returned to ROM by reload
System restarted at 18:05:46 UTC Sat Jun 28 2003
System image file is "bootflash:cat4000-is-mz.121-8a.EW1.bin"
For the IPv4 exploit, which version should I upgrade to?
Thanks