Ethernet Switching and Bridging
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Support for increased MAC learning capability (EX2300, EX3400, EX4300, and EX4400)—Starting in Junos OS Release 22.3R1, if you enable software-based media access control (MAC) learning on the switch, the Packet Forwarding Engine caches the first ingress packet with a unique MAC ID. The packet is reinserted automatically after the MAC ID is added to the Ethernet table in the Routing Engine.