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Chapter 15 MAC Table Configuration
15.1 Introduction to MAC Table
MAC table is a table identifies the mapping relationship between destination MAC addresses and Chassis
Switch ports. MAC addresses can be cat egorized as static MAC addresses and dynamic MA C addresses.
Static MAC addresses are manually configured by the user, have the highest priority and are permanently
effective (will not be overwritten by dynamic MAC addresses); dynamic MAC addresses are entries learnt by
the Chassis Switch in data frame forwarding, and is effective for a limited period. When the switch receives a
data frame to be forwarded, it stores the source MAC address of the data frame and creat es a mapping to the
destination port. Then the MAC table is queried for the destination MAC address, if hit, the data frame is
forwarded in the associated port, otherwise, the Chassis Switch forwards the data frame to its broadcast
domain. If a dynamic MA C address is not learnt from the data frames to be forwarded for a long time, the
entry will be deleted from the switch MAC table.
There are two MA C table operations:
1.
Obtain a MA C address.
2.
Forward or filter data frame according to the MA C table.
15.1.1 Obtaining MAC Table
The MAC table can be built up statically and dynamically. Static configuration is to set up a mapping bet ween
the MAC addresses and the ports; dynamic learning is the process in which the Chassis Switch learns the
mapping between MAC addresses and ports, and updat es the MA C table regularly. In t his section, we will
focus on the dynamic learning process of MA C table.
PC1
MAC 00-01-11-11-11-11
MAC 00-01-22-22-22-22
Port 5
PC2
MAC 00-01-33-33-33-33
Figure 15-1-1 MAC Table dynamic learning
Port 12
PC3
MAC 00 01 44 44 44 44
15-1
PC4
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