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Why Cannot the Switch Learn an MAC Address?

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The possible causes are:

  • The mac-limit command is used on an interface and the VLAN that the interface belongs to and the number of dynamic MAC address entries learned by the interface reaches the limit.

  • MAC address learning is disabled on the Ethernet interface and the VLAN that the interface belongs to by using the mac-address learning disable command.

  • A blackhole MAC entry or static MAC entry is created or the sticky MAC function is enabled.

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