EVPN E-Tree: Juniper NSN Carrier Ethernet Transport

The Juniper NSN Carrier Ethernet Transport solution supports Metro Ethernet Forum (MEF) Ethernet Tree (E-TREE) services using centralized virtual switch instances (VSIs). E-TREE is a rooted multipoint service, where end points are classified as Roots and Leaves. Root end points can communicate with both Root and Leaf end points, but Leaf end points can only communicate with the Root end points. Juniper's NSN CET solution employs E-TREE services using a centralized VSI model. This means that VSIs are only provisioned on certain selected PEs. End points are connected to these central VSIs using spoke pseudowires. The centralized VSI model uses a lower number of pseudowires and less bandwidth than the distributed VSI model.