This command would display a non-empty output if your router had a switching module installed, such as HWIC-4ESW or similar, because in that case, the router also has a switching hardware and behaves both as a router and as a switch. On a router, you may find that the show mac address-tableĬommand is supported. Note that MAC address table and ARP table have nothing in common, and you do not need to maintain one to populate the other. ARP table maps IP addresses of directly attached neighbors to their MAC addresses. MAC address table maps MAC addresses to switchports where the owners of individual MAC addresses are attached. Please do not confuse MAC address table and an ARP table. ![]() ![]() Routers do not normally maintain MAC address tables.
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