One way of designing this is as follows:
Aggregation tier - N7Ks
- Provider Edge of the network.
- Server VLANs assigned to server VRFs.
- OSI Layer3/OSI Layer 2 boundary in the network.
- Hosts the OSI Layer3 server SVIs.
- Hosts OSI Layer2 server VLANs.
- Active/active HSRP for the server SVIs.
- OSI Layer3 uplinks to the core.
- vPC downlinks to the Access tier
Access Tier - N5Ks
- Customer edge of the network.
- OSI Layer2 vPC uplinks to the Aggregation tier.
- Aggregates uplinks from dual homed servers.
- Hosts server OSI Layer2 VLANs.