Is C1E1TN9300XF Mandatory for Nexus Switches?
The SKU 'C1E1TN9300XF-3Y' is for 3 years Cisco Essentials licensing, it isn't mandatory however if we want to make of layer 3 and above features on the switch we will need to add a license for the switch:
To see which features are included as part of this license please see Table 2 in the following link: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/nx-os/licensing/guide/b_Cisco_NX-OS_Licensing_Guide/b_Cisco_NX-OS_Licensing_Guide_chapter_01.html
The services that are available if you do not buy this license
Layer 2 features: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/92x/Layer-2_switching/configuration/guide/b-cisco-nexus-9000-nx-os-layer-2-switching-configuration-guide-92x/b-cisco-nexus-9000-nx-os-layer-2-switching-configuration-guide-92x_chapter_011.html