has any body done CRS-1/8 to CRS-3/8 upgrade smoothly ? from the CCO I could find only that it needs IOS-XR 4.0 and Fabric Upgrade.
just want to make sure these are the only two actions to perform to make CRS-1 to CRS-3,
my upgrading procedure will be as follows
1. Upgrade the code to IOS-XR 4.0 with CRS-1 fabric.
2. once the router is loaded with 4.0, replace Fabric cards one by one.
Need your comments.