Seamless EVPN-VXLAN stitching

Juniper Networks supports the seamless stitching of unicast and broadcast, unknown unicast, and multicast (BUM) routes in the following use cases:

• Interconnected EVPN-VXLAN points of delivery (PODs) in a data center.
• Interconnected EVPN-VXLAN data centers (data center interconnect [DCI]).

In these use cases, the Juniper Networks devices, either single-homed or multihomed in all-active mode, can serve as either a spine or super spine device that interconnects the PODs or data centers through an EVPN-VXLAN WAN network. 
To enable the interconnection, you configure a single EVPN instance (EVI) of type virtual-switch on each Juniper Networks device. Or, you can use the default switching instance. In this instance, you specify these elements: Two sets of route distinguishers and route targets. The first set is for the POD or data center network, and the other, which you specify using the interconnect stanza of configuration statements, is for the WAN network.
An Ethernet segment identifier (ESI) if a Juniper Networks device is multihomed using an aggregated Ethernet interface.

• A list of VXLAN network identifiers (VNIs). 

• After you configure these elements, the EVPN control plane stitches the EVPN routes from the POD or data center network and from the WAN network into a single MAC forwarding table.