Entries in a MAC address table are classified into dynamic, static, and blackhole entries. In addition, the MAC address table of a switch also contains service MAC address entries, which are typically converted from dynamic entries.
Huawei classifies the principal MAC address-table entries as dynamic, static and blackhole entries:
Dynamic entries are learned automatically from the source MAC addresses of received frames and are subject to aging.
Static entries are manually configured, do not age and remain after a saved configuration is restarted.
Blackhole entries are manually configured to discard frames sourced from or destined for specified MAC addresses.
Service modules can further classify or convert dynamically learned entries according to a particular service. Huawei examples include secure MAC, authentication MAC, guest MAC and MUX MAC entries. These are collectively referred to as service MAC address entries. Their forwarding and aging behavior is controlled by the feature that created or converted them—for example, port security, access authentication or MUX VLAN.
Therefore, the statement is correct: in addition to the three fundamental MAC-entry classes, a switch may contain service-specific MAC entries that are generally derived from or further classifications of dynamically learned entries. Huawei MAC address-entry classification
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