Cisco Nexus 3172 (N3K-C3172)  series switches was announced in 2013.
Based on BCM56850 StrataXGS® Trident2.
Here  you can read about Cisco Nexus 3172  architecture. 
View datasheet for Nexus 3172
- 1.4-Tbps switching capacity
- Forwarding rate of up to 1 bpps
- Line-rate traffic throughput (both Layer 2 and 3) on all ports
N3K-C3172 supporting VXVLAN BGP EVPN from NX-OS version 7.0(3)I4(1) 
This switches can work in N3K mode or in N9K mode.
In N9K mode switch will follow N9K license model.
Here is a list of 6 models in N3K-3172 line, they have some difference in specifications:
| Switch model | Ports layout | System memory | Boot flash | 
|---|---|---|---|
| Cisco N3K-C3172PQ-10GE | 48 SFP+ и 6 QSFP+ | 4 GB | 2 GB | 
| Cisco N3K-C3172PQ-XL | 48 SFP+ и 6 QSFP+ | 8 GB | 16 GB | 
| Cisco N3K-C3172TQ-10GT | 48 10G BASE-T и 6 QSFP+ | 4 GB | 2 GB | 
| Cisco N3K-C3172TQ-32T | 32(48 need lic) 10G BASE-T и 6 QSFP+ | 4 GB | 2 GB | 
| Cisco N3K-C3172TQ-XL | 48 10G BASE-T и 6 QSFP+ | 8 GB | 16 GB | 
| Cisco N3K-C31128PQ-10GE | 96 SFP+ и 8 QSFP+ | 64 GB SSD | 
Licenses in N3K mode:
| Base license (N3K-BAS1K9) | ●   Static routing ● RIPv2 ● EIGRP stub ● OSPFv2 (limited routes) ● PIMv2 (sparse mode) | 
| LAN Enterprise license | ●  OSPF (unlimited routes) ● EIGRP (unlimited routes) ● BGP ● Policy-Based Routing ● Generic routing encapsulation (GRE) tunnels ● Protocol Independent Multicast (PIM) Source-Specific Multicast (SSM) mode ● VXLAN ● VXLAN bridging with BGP eVPN control plane ( c софта 7.0(3)I4(1) ) Note The Layer 3 Base Services Package license is a prerequisite for the Layer 3 Enterprise Services Package license on Cisco Nexus 3000 and 3100 Series switches, except the Cisco Nexus 3164Q, 31128PQ, 3232C, and 3264Q switches and the Cisco Nexus 3100-V Series switches. | 

 
			 
			