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more VLANs or this could be a VPLS domain as you can take the VPLS elements to implement inside the Data Centre and the EVPN to provide Layer 2 between data centres. The following features are available for EVPNs: •Ethernet connectivity between data centres spanning metropolitan area networks (MANs) and WANs •One VLAN for each MAC VPN •Automatic route distinguishers •Active Standby multihoming INTERNAL USE ONLY — DO NOT SHARE
Juniper Networks Design Fundamentals Sample Request for Proposal • Appendix C-33 Contrail Another option, which leverages the open standards of MPLS and the newer functionality of Juniper SDN approach, is through the use of Contrail. From a Data Centre perspective, Juniper has developed Contrail, which is an open source SDN solution that automates and orchestrates a virtual network overlay. All of the networking features such as switching, routing, security, and load balancing are moved from the physical hardware infrastructure to software running in the hypervisor kernel that is managed from a central orchestration system. Contrail The Contrail system consists of two main components: Contrail SDN Controller and Contrail vRouter. Contrail SDN Controller is a logically centralized but physically distributed SDN controller that is responsible for providing the management, control, and analytics functions of the virtualized network. The Contrail vRouter is a forwarding plane (of a distributed router) that runs in the hypervisor of a virtualized server. It extends the network from the physical routers and switches in a data centre into a virtual overlay network hosted in the virtualized servers. Contrail vRouter is conceptually similar to existing commercial and open-source vSwitches such as the Open vSwitch (OVS), but it also provides routing and higher-layer services (for example, vRouter instead of vSwitch). The Contrail SDN Controller provides the logically centralized control plane and management plane of the system and orchestrates the vRouters. Virtual Networks Virtual Networks (VNs) are a key concept in the Contrail system. VNs are logical constructs implemented on top of the physical network. They are used to replace VLAN-based isolation and provide multi-tenancy in a virtualized data centre. Each tenant or an application can have one or more virtual networks. Each virtual network is isolated from all the other virtual networks unless explicitly allowed by security policy. Overlay Networking VNs can also be implemented using two networks—a physical underlay network and a virtual overlay network. This overlay networking technique has been widely deployed in the wireless LAN (WLAN) industry for more than a decade, but its application to data centre networks is relatively new. It is being standardized in various forums such as the Internet Engineering Task Force (IETF) through the Network Virtualization Overlays (NVO3) working group and has been implemented in open-source and commercial network virtualization products from a variety of vendors.