H3C H3C S5100-SI, Operation Manual, Page: 183 / 830

1-2
Figure 1-1 MAC address learning diagram (1)
Figure 1-2 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 User B in the existing MAC address table, the switch
forwards the packet to all ports except GigabitEthernet 1/0/1 to ensure that User B can receive the
packet.
Figure 1-3 MAC address learning diagram (2)
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 Figure 1-4 . When the response
packet from User B is sent to GigabitEthernet 1/0/4, the switch records the association between the
MAC address of User B and the corresponding port to the MAC address table of the switch.