Neutron provides network services for OpenStack.

In OpenStack Neutron, the core network abstraction models are Network, Subnet, and Port , which align with Huawei CloudFabric’s logical network design principles. A Network represents a Layer 2 broadcast domain, similar to a VXLAN segment (VNI) in Huawei data center fabrics. It provides tenant-level isolation and forms the foundation for overlay networking.

A Subnet defines the Layer 3 IP addressing scheme within a network, including CIDR blocks, gateway addresses, and DHCP configurations. This aligns with Huawei’s underlay/overlay separation, where IP addressing is critical for both service reachability and automation.

A Port is the connection point between a virtual machine (VM) and the virtual network, equivalent to a virtual NIC. It carries MAC/IP bindings and security policies, similar to endpoint definitions in EVPN-based fabrics.

The option vRouter is incorrect because Neutron uses the concept of a Router , not “vRouter,” and it is considered a higher-layer service component rather than a fundamental network model. Huawei documentation consistently emphasizes these three as the foundational constructs for virtualized network design.