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EVPN-VxLAN provides a scalable and efficient multitenant solution within the data center. However, a gateway function is required when Network Virtualization Edge (NVEs), the logical entities that provide overlays or where encapsulation and decapsulation occur, in different data centers need to be interconnected. A GW allows using VNIs as globally unique identifiers. It translates VNI when crossing network boundaries, which may align with operator span-of-control boundaries. This deployment model is usually called Multisite DCI. Two gateways can also be connected to each other using Multi-chassis Link Aggregation (MC-LAG) to provide redundancy.
For example, assume there are three network operators for the network shown in Figure 2: one for each of the DC1, DC2, and WAN networks. The gateways at the edge of the data centers are responsible for translating the VNIs between the values used in each of the DCNs and the values used in the WAN.