H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 136)

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MAC Address Table Management Configuration
When configuring MAC address table management, go to these sections for information you are
interested in:
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Introduction to MAC Address Table
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Configuring MAC Address Table Management
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Displaying and Maintaining MAC Address Table Management
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MAC Address Table Management Configuration Example
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The term switch in this document refers to a switch in a generic sense or an access controller
configured with the switching function unless otherwise specified.
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This guide covers only static, dynamic and blackhole MAC address table management. For the
management of multicast MAC address table management, refer to Multicast Protocol in H3C
WX6103 Access Controller Switch Interface Board Configuration Guide .
Introduction to MAC Address Table
A switch maintains a MAC address table for frame forwarding. Each entry in this table contains the MAC
address of a connected device, to which port this device is connected and to which VLAN the port
belongs.
A MAC address table consists of two types of entries: static and dynamic. Static entries are manually
configured and never age out. Dynamic entries can be manually configured or dynamically learned and
may age out.
The following is how a switch learns a MAC address after it receives a frame from a port, port A for
example:
1) Check the frame for the source MAC address (MAC-SOURCE for example), and consider frames
with destination MAC address MAC-SOURCE be forwarded through port A.
2) Look up the MAC address table for an entry corresponding to the MAC address and do the
following:
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If an entry is found for the MAC address, update the entry.
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If no entry is found, add an entry containing the MAC address and port A.
When receiving a frame destined for MAC A, the switch then looks up the MAC address table and
forwards it from port A.