Operation Manual –
MAC
Address
Forwarding
Table
Quidway S3100 Series Ethernet Switches
Chapter 1 MAC Address Table Management
Huawei Technologies Proprietary
1-2
Table 1-1 lists the different types of MAC address entries and their characteristics.
Table 1-1
Characteristics of different types of MAC address entries
MAC address entry
Configuration
method
Aging time
Reserved or not at
reboot (if the
configuration is
saved)
Static MAC address
entries
Manually configured
Unavailable
Yes
Dynamic MAC
address table
Manually configured
or generated by
MAC address
learning mechanism
Available No
Blackhole MAC
address entry
Manually configured
Unavailable
Yes
1.1.3 MAC Address Learning Mechanism
The MAC address learning mechanism enables a switch to acquire the MAC addresses
of the network devices on the segments connected to the ports of the switch. A packet
can be directly forwarded if its destination MAC address is already learnt by the switch.
The MAC address learning mechanism is implemented as follows:
z
When a switch receives a packet from one of its ports (referred to as Port A), the
switch extracts the source MAC address (referred to as MAC-S) of the packet and
considers that the packets destined for MAC-S can be forwarded through Port A.
z
If the MAC address table already contains MAC-S, the switch refreshes the aging
time of the corresponding MAC address entry. Otherwise, the switch adds MAC-S
and Port A as a new MAC address entry to the MAC address table.
z
The switch searches the MAC address table for the destination MAC address of
the received packet. If it finds a match, it directly forwards the packet, or else it
broadcasts the packet in the corresponding VLAN.
z
When a broadcast packet reaches the network device whose MAC address is the
destination MAC address of the packet, the network device returns a packet to the
switch, with its MAC address contained in the packet.
z
The switch extracts the MAC address of the network device from the returned
packet and adds a MAC address entry accordingly in its MAC address table. After
that, the switch can directly forward other packets destined for the same network
device by the newly added MAC address entry.
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