3Com 4500 PWR 26-Port Configuration Manual page 218

Generally, the majority of MAC address entries are created and maintained through MAC address
lear ning. The following describes the MAC address learning process of a switch:
1) As shown in Figure
User B, the packet from User A needs to be transmitted to Ethernet 1/0/1. At this time, the switch
records the source MAC address of the p
address table of the switch,
Figure 18-1 MAC address learni
Figure 18-2 MAC address table entry of the switch (1)
2) After learning the MAC address of User A, the switch starts to forward the packet. Because there is
no MAC address and port information of
forwards the packet to all ports e
Figure 18-3 MAC address learni
3) Because the switch broadcasts the packet, both User B and User C can receive the packet.
However, User C is not the destination device of the packet, and therefore does not process the
packet. Normally, User B will respond to User A, as shown in
18-1, User A and User B are both in VLAN 1. When User A communicates with
acket, that is, the address MAC-A of User A to the MAC
forming an entry shown in
ng diagram (1)
User B in the existing MAC address table, the switch
xcept Ethernet 1/0/1 to ensure that User B can receive the packet.
ng diagram (2)
18-2
Figure 18-2 .
Figure 18-4. When the response