As data centers are being upgraded from less reliable Layer 2 networks to new and robust leaf-spine topologies, there are still applications that use Layer 2 networks. There is a growing concern to fit such a solution that expects Layer 2 connectivity in a network that has Layer 3 as its foundation.

Ethernet VPN (EVPN) solves this issue by building a virtual Layer 2 network overlay over the underlying Layer 3 network. It uses BGP as its control protocol.

EVPN is a developed technology used in service provider Multiprotocol Label Switching (MPLS) networks for some time. A variation of this technology is now being adopted in the data center world using Virtual Extensible LAN (VxLAN).

EVPN supports network virtualization and multitenancy which divides up a single physical network into many virtual networks. Virtualizing a physical network allows it to be shared between multiple tenants making efficient use of the network. The physical underlay network over which these virtual networks are transported is unaware that it is transporting multiple virtual overlay networks.

Besides Layer 2 and Layer 3 fabrics, the Dell Enterprise SONiC OS supports advanced deployment models or solutions that extend into overlays, multisite fabrics, and Telco use cases.

The following use cases highlight the capabilities of the operating system that bring unique value to our customers.