Meaning of MAC address flapping on S series switches

For S series switches (except the S1700), MAC address flapping occurs when a MAC address is learned by two interfaces in the same VLAN and the MAC address entry learned later overrides the earlier one. For example, in the MAC address entry with the MAC address 0011-0022-0034 and VLAN 2, the outbound interface is changed from Port1 to Port2. In this case, MAC address flapping occurs. MAC address flapping can cause an increase in the CPU usage on the switch. Generally, MAC address flapping occurs when a loop exists on the network. S series switches support MAC address flapping detection and take configured actions after detecting MAC address flapping.

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