![]() ![]() If you have an issue and clear the mac-address-table for a brief time the table is empty and the switch begins to see traffic and will rebuild the mac-address-table. (note in case of confusion: switch watches the source mac to build the forwarding table, and uses the destination mac to look in the forwarding table and find the correct output interface) Once the MAC address is in the table then the switch uses that entry to make layer 2 forwarding decisions (the switch decides which interface matches the destination MAC for frame that it is forwarding). With each incoming frame the switch looks at the source MAC address and associates that MAC address with the interface on which the frame was received. It is built by the switch as the switch processes frames going through the switch. The mac-address-table is used by the switch for layer 2 forwarding. Depending on what your issue is and what you are attempting to accomplish it may be advisable to clear one or the other, or even perhaps both. The mac-address-table and the arp cache are quite separate and distinct. ![]()
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