As discussed earlier following set of Hardware supporting this feature:
Summit X460,X480,X650, X670 and E4G
BD8900 (G96T-c,10G24-x,G48T-XL, G48X-XL,10G8X-XL,40G6X-xm)
BDX8 (all I/O cards)
Note:
Provided all blades in the chassis or nodes in a stack need to support GRE tunnels or else the feature cannot be configured or enabled.
Not sure in your scenario if you are using any stack X460 switch or stand alone switch to achieve this. If any stack switch then the above point needs to be considered.
Coming to the recommended software version for this hardware(X460) : Exos16.1.3.6p1-9 is currently in use.