On Juniper Networks EX4400 you can enable a router or switch to forward LAN broadcast traffic on only custom UDP ports to specified servers by configuring port helpers with the [edit forwarding-options helpers] port configuration statement. Port helpers are also referred to as port forwarding or UDP broadcast packet forwarding services. When you configure a port helper, the router or switch listens for incoming UDP traffic for the configured port with destination Layer 2 MAC and Layer 3 IP broadcast addresses, and forwards the packets as unicast traffic to a configured server.

Port-based LAN Broadcast Packet Forwarding has been introduced on JunOS 23.2R1 for EX4400 switches. Proceed with upgrade if you are running a previous version.

For configuration guidelines, please refer to: https://www.juniper.net/documentation/us/en/software/junos/sampling-forwarding-monitoring/topics/task/policy-configuring-lan-broadcast-packet-forwarding.html

07/2023 - KB Creation