The switch needs to work with a CIS server.
ECA is a basic feature of a switch and is not under license control.
Only the following switch models support ECA:
S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-HI, S6730-H, S6730S-H, S6730-S, S6730S-S
For details about software mappings, visit Hardware Query Tool and search for the desired product model.