Are you using FAS2552 in cluster-mode(Clustered Data ONTAP) or 7-mode? For cluster interconnect in cluster-mode, CN1610 is recommended. For other ethernet network, any standard ethernet switch which has physically compatible ports will work - 1G copper ethernet for e0a/e0b/e0M, and 10G SFP+ for CNA ports.
If you use CNA ports for FC SAN, you should check supported configuration using InteroperabilityMatrix Tool(IMT). Open IMT, click change, and select "SAN-Switch (FAS, E-Series, FlashRay)".