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Use Case and Reference Architecture

Figure 1 depicts a typical enterprise WAN with edge and backbone/core network infrastructure interconnecting enterprise users in campus and branch segments, enabling L2/L3 connectivity over an EVPN-MPLS/EVPN-VPWS service enabling access to different enterprise-specific applications running in an enterprise private data center or in a public cloud network provider such as AWS, GCP or Azure and so on.

Figure 1: Typical Enterprise Network with EVPN as Unified Service Protocol A diagram of a cloud network Description automatically generated

EVPN-MPLS, EVPN-VPWS, and EVPN with Type 5 routes serve as the primary connections used by enterprises to connect the branch offices and campuses with the central headquarters network. At the edge, hierarchical CoS is employed to prioritize high-priority application/VLAN traffic over others, effectively ensuring optimal usage of network resources.

To secure the headquarter network edge devices connected to the internet, DDoS protection mechanisms, such as BGP FlowSpec, are enabled to block ICMP flood attacks. Unicast reverse-path forwarding (unicast RPF) is also activated on the interfaces to safeguard against attacks originating from unexpected source addresses.

The core/backbone network is built using segment-routing (SR) based MPLS transport. It also covers the migration scenarios where part of the network runs LDP, while the other part utilizes SR.

The latest Juniper ACX and MX platforms are introduced to support various port speeds, ranging from 1G/10G/100G in the edge/access WAN segment to 400G for the core/transport networks. This solution provides a broad range of network platforms, including MX-routers built on Juniper Networks custom silicon (Trio chip sets), and compact ACX pizza box routers based on Broadcom ASICs. The selection of a specific platform largely depends on several factors such as: platform size, power consumption, port density, feature richness, future feature capacity, and key logical scale indexes. This solution aims to validate all mentioned platforms as part of the coherent solution for the enterprise WAN with a given subset of requirements.

This JVD outlines the preferred choice of ACX and MX series routers as enterprise WAN edge devices, while PTX series routers act as the backbone of the enterprise WAN and as BGP route reflectors in the network.