Explanation:

There are two virtual routing and forwarding (VRF) instances configured on a Nexus 7000 by default: the management VRF and the default VRF. The management VRF is used only for management, includes only the mgmt 0 interface, and uses only static routing.

VRFs are used to logically separate Open Systems Interconnection (OSI) networking model Layer 3 networks. Therefore, it is possible to have overlapping Internet Protocol version 4 (IPv4) or Internet Protocol version 6 (IPv6) addresses in environments that contain multiple tenants. However, an interface that has been assigned to a given VRF cannot be simultaneously assigned to another VRF. The address space, routing process, and forwarding table that are used within a VRF are local to that VRF.

The default VRF, on the other hand, includes all Layer 3 interfaces until you assign those interfaces to another VRF. Similarly, the default VRF runs any routing protocols that are configured unless those routing protocols are assigned to another VRF. All show and exec commands that are issued in the default VRF apply to the default routing context. Unless an administrator configures other VRFs on a Nexus 7000, any forwarding configurations that are made by the administrator will operate in the default VRF.

Reference:

Cisco Press CCNA Data Center DCICT 200-155 Official Cert Guide, Chapter 6: Virtualizing Cisco Network Devices, Describing Layer 3 Virtualization Within VDCs, pp. 204-206

Cisco Press CCNA Data Center DCICT 200-155 Official Cert Guide, Chapter 13: ACI Logical Model and Policy Framework, ACI Logical Constructs, pp. 488-492

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