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6.9.4 MAC address table
MAC
(
Media Access Control
)
address is the network device hardware identification, the switch to
forward packets based on MAC addresses. The MAC address is unique, which ensures correct packet
forwarding. Each switch maintains a MAC address table. In this table, MAC addresses and switches port
one-to-one correspondence. When the switches received a data frame, according to the MAC address
table to determine the filter or forward the data frame corresponding to the switch port. MAC address table
is the basis and premise of the switch to achieve fast forwarding.
(
Figure 6.9.4
)
MAC address classify into three types in device address MAC address list:
1. Dynamic MAC address
Dynamic MAC address of the switches in the network through the data frame to learn, when the arrival
of aging time will be deleted. When the device is connected to the switch port to change the MAC address
table and port corresponding relationship will change accordingly. Dynamic MAC address of the switch is
powered restart will disappear, the need to re-learn.
2. Static certification (solidify) MAC address
Static authentication MAC address by configuring IEEE 802.1x authentication, the switch will not be
aging. Regardless of the device is connected to the switch port happen to the MAC address table MAC
address and port corresponding relationship always will not change, the relationship is completely
controlled by the IEEE 802.1X authentication server. Static MAC address after the switch is powered
restart will disappear.
3. Permanent static MAC addresses
permanent MAC address generated through configuration will not be aging, regardless of the device is
connected switches of the change of the port, the MAC address table of MAC address and port of
corresponding relation is always does not change, permanent MAC address does not disappear after the
switch is restart
MAC address table can specify the sort type, can choose "auto" and "MAC" two sort types, MAC
address and related forwarding port will be showed in this table. if the status bar displays "certification"
,