Chapter 10 Mac Table Configuration; Introduction To Mac Table; Obtaining Mac Table - Edge-Core ES4624-SFP Basic Management Manual

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Chapter 10 MAC Table Configuration

MAC table is a table identifies the mapping relationship between destination MAC

addresses and switch ports. MAC addresses can be categorized as static MAC

addresses and dynamic MAC 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 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 creates 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 switch forwards the data frame to its broadcast domain. If a dynamic MAC

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 MAC table operations:

1. Obtain a MAC address.

2. Forward or filter data frame according to the MAC table.

The MAC table can be built up staticly and dynamically. Static configuration is to set

up a mapping between the MAC addresses and the ports; dynamic learning is the

process in which the switch learns the mapping between MAC addresses and ports, and

updates the MAC table regularly. In this section, we will focus on the dynamic learning

process of MAC table.