What are the differences between the CRS-1 and CRS-3 platforms? I know the CRS-3 is the upgrade to CRS-1.

Do I need a new chassis to upgrade to CRS-3? Or is a CRS-1 chassis upgradable to a CRS-3 just upgrading the RP, MSC and Fabric cards?

What is upgraded to get from CRS-1 to CRS-3? All of the below or just a few pieces?

• Chassis
• RP
• Fabric Card
• MSC

Thanks