Cisco CRS-1 - Carrier Routing System Router - Page 245

B-1
Cisco CRS-1 Carrier Routing System to Cisco CRS-3 Carrier Routing System Migration Guide
OL-13669-03
APPENDIX
B
Cisco CRS-1 to Cisco CRS-3 Upgrade Decision
Trees
This appendix contains three decision trees that describe the Cisco CRS-1 to Cisco CRS-3 upgrade
process.
The three illustrations describe the following processes:
• Upgrading from Cisco IOS XR software Releases Earlier Than Release 3.8 to
Cisco IOS XR software Release 4.0.1
• Upgrading from Cisco IOS XR software Releases Later Than Release 3.8 That Do Not Support FPD
Auto-Upgrade to Cisco IOS XR software Release 4.0.1
• Upgrading from Cisco IOS XR software Releases That Support FPD Auto-Upgrade (Release 3.8.4
and Release 3.9.1) to Cisco IOS XR software Release 4.0.1