3Com 4210 PWR Configuration Manual page 134

132 C 13: MAC A
HAPTER
T M
DDRESS ABLE ANAGEMENT
packet, that is, the address "MAC-A" of User A to the MAC address table of the
switch, forming an entry shown in Figure 42.
Figure 41 MAC address learning diagram (1)
User B
Eth1/0 /4
User A
Figure 42 MAC address table entry of the switch (1)
MAC-address
MAC-A
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 Ethernet
1/0/1 to ensure that User B can receive the packet.
Figure 43 MAC address learning diagram (2)
User B
Eth1/0 /4
User A
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 44. When the response packet from User B is sent to Ethernet 1/0/4, the
User C
Eth1/0/3
Eth1/0/1
Port VLAN ID
Ethernet1/0/1 1
User C
Eth1/0/3
Eth1/0/1