Operation Manual – MAC Address Table ManagementH3C S3100 Series Ethernet SwitchesChapter 1 MAC Address TableManagement1-21.1.2 Introduction to MAC Address LearningMAC address table entries can be updated and maintained through the following twoways:z Manual configurationz MAC address learningGenerally, the majority of MAC address entries are created and maintained throughMAC address learning. The following describes the MAC address learning process of aswitch:1) As shown in Figure 1-1, User A and User B are both in VLAN 1. When User Acommunicates with User B, the packet from User A needs to be transmitted toEthernet 1/0/1. At this time, the switch records the source MAC address of thepacket, that is, the address MAC-A of User A to the MAC address table of theswitch, forming an entry shown in Figure 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 existingMAC address table, the switch forwards the packet to all ports except Ethernet1/0/1 to ensure that User B can receive the packet.
