When the S12700, S7700, S9700, S9300, S5720-HI, S5730-HI, S6720-HI, S6720-EI, or S6720S-EI functions as the parent and needs to have the SVF function enabled, a license is required. When the S12700E, S5731-H, S5731S-H, S5732-H, S6720-SI, S6720S-SI, S6730-H, S6730S-H, S6730-S, or S6730S-S functions as the parent and needs to have the SVF function enabled, no license is required.
The license controls only the SVF function but not the SVF service specifications and only needs to be loaded on the parent.
For details about how to apply for a license, see Obtaining Licenses in the S1720, S5700, and S6700 Series Switches License Usage Guide.