Assisted replication with EVPN-VXLAN overlay networks

Junos OS supports assisted replication (AR) in data centers with EVPN-VXLAN networks to optimize replication of BUM traffic being forwarded into the EVPN core. Instead of flooding BUM traffic using ingress replication, devices configured as AR leaf devices forward the traffic to an AR replicator device that can better handle the replication load, and only the AR replicator device replicates and forwards the traffic to the overlay tunnels. AR devices advertise EVPN Type 3 (Inclusive Multicast Ethernet Tag [IMET]) routes that include special AR Type and Flags fields indicating AR device roles. The network can also include devices that do not support AR (regular network virtualization edge (RNVE) devices), which ignore AR routes and use ingress replication to forward BUM traffic toward the EVPN core. You can configure AR with IGMP snooping to further optimize BUM traffic replication and forwarding. To enable assisted replication and configure devices into AR replicator or AR leaf roles, use the assisted-replication configuration statement at the [edit protocols evpn] hierarchy level.