I have the solution for my question:
Nexus 2000 with Nexus 7000 Support Details:
- Initial support for 2248T (100/1G FEX) in 5.1 release
- Up to 32 attached Nexus 2248T systems per Nexus 7000 (~1500 100/1G ports per Nexus 7000)
- Works only with shipping 32-port 4:1 oversubscribed 10G I/O module (N7K-M132XP-12) and the imminent XL equivalent
(so no N7K-M108X2-12L nor F1 modules)
I do not need the Scalable Feature License.