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Hierarchy Level


Configure a device in an EVPN network into the assisted replication (AR) leaf role. AR leaf devices might also be called AR client devices.

AR helps to optimize broadcast, unknown unicast, and multicast (BUM) traffic in EVPN networks. To enable AR, you configure devices in the EVPN network to operate as AR replicator and AR leaf devices.

AR replicator devices help perform BUM traffic replication and forwarding tasks for AR leaf devices. When an AR leaf device receives BUM traffic, instead of always using ingress replication to the EVPN core, it forwards the traffic on an AR tunnel to an AR replicator device that can better handle the replication load. The AR replicator device then replicates and forwards the traffic to other overlay tunnels. You configure a loopback interface IP address on each AR replicator device for the AR tunnel.

You can configure multiple AR replicator devices in an EVPN network, and AR leaf devices load-balance among the available AR replicator devices as follows:

  • AR leaf devices that are EX4650 switches or switches in the QFX5000 line automatically designate a particular AR replicator device for a VLAN or VXLAN network identifier (VNI) to load-balance among the available AR replicators.

  • AR leaf devices in the QFX10000 line of switches actively load-balance among the available AR replicators based on traffic flow levels within a VLAN or VNI.



Interval (in seconds) to wait after receiving an AR replicator route from an AR replicator before starting to forward traffic to it. You might want to adjust the delay to make sure AR replicator devices have fully learned the current EVPN state from the network after an AR replicator goes down and comes back up again.

  • Default: 10 seconds

  • Range: 0 through 180 seconds

Required Privilege Level


Release Information

Statement introduced in Junos OS Release 18.4R2 and 19.4R1.