Cisco 4000 Series Routers

• Cisco IOS Release 12.1
  Cross-Platform Release Notes

• Cisco 4000 Series - Cisco IOS Release 12.1 T

• Caveats
  Caveats documentation for Cisco IOS Releases 12.2 and 12.2 T (includes open and resolved severity 1 & 2 caveats and select severity 3 caveats for all platforms)