Hello, I bought these three devices:

CCR2116-12G-4S+
CRS326-24S+2Q+
CRS354-48G-4S+2Q+
Could you guide me on how to set up a ring configuration with them, so that each 10G port from the CCR2116 connects to each CRS, and then link the CRSes together with one or two 10G connections?

Do you need a coherent Layer2 between all devices? or just the switches?
Why ring? For redundancy? load balancing? Physical constraints?

only Layer2 and For redundancy