D-Link DES-3550 Product Manual - Page 282
Forwarding Table, Table - 3 ARP Payload, Table - 4 Ethernet frame format
UPC - 790069266317
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xStack® DES-3500 Series Layer 2 Stackable Fast Ethernet Managed Switch User Manual When PC B replies to the ARP request, its MAC address will be written into "Target H/W Address" in the ARP payload shown in Table-3. The ARP reply will be then encapsulated into the Ethernet frame again and sent back to the sender. The ARP reply is in a form of Unicast communication. H/W Protocol H/W Protocol Operation Sender type type address address length length H/W address Sender protocol address Target H/W address Target protocol address ARP reply 00-20-5C-01-11-11 10.10.10.1 00-20-5C-01-22-22 10.10.10.2 Table - 3 (ARP Payload) When PC B replies the query, the "Destination Address" in the Ethernet frame will be changed to PC A's MAC address. The "Source Address" will be changed to PC B's MAC address (see Table-4). Destination address Source address Ether-type ARP FCS 00-20-5C-01-11-11 00-20-5C-01-22-22 Table - 4 (Ethernet frame format) The switch will also examine the "Source Address" of the Ethernet frame and find that the address is not in the Forwarding Table. The switch will learn PC B's MAC and update its Forwarding Table. Forwarding Table Port1 00-20-5C-01-11-11 Port2 00-20-5C-01-22-22 267