3Com 4210 PWR Configuration Manual

Also see for Switch 4210 9-Port: Getting started Getting started Datasheet Configuration guide

Contents

3Com 4210 PWR Configuration Manual Manual pdf 134 page image

132 CHAPTER 13: MAC ADDRESS TABLE MANAGEMENTpacket, that is, the address "MAC-A" of User A to the MAC address table of theswitch, forming an entry shown in Figure 42.Figure 41 MAC address learning diagram (1)Figure 42 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.Figure 43 MAC address learning diagram (2)3 Because the switch broadcasts the packet, both User B and User C can receive thepacket. However, User C is not the destination device of the packet, and thereforedoes not process the packet. Normally, User B will respond to User A, as shown inFigure 44. When the response packet from User B is sent to Ethernet 1/0/4, theEth1/0/1Eth1/0/3Eth1/0 /4User AUser B User CPort VLAN IDMAC-addressEthernet1/0/1 1MAC-AEth1/0/1Eth1/0/3Eth1/0 /4User AUser B User C