D-Link DES-3526 - Switch - Stackable User Manual page 282

Xstack des-3500 series layer 2 managed stackable fast ethernet switch
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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
type
type
address
length
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
00-20-5C-01-11-11
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
®
DES-3500 Series Layer 2 Stackable Fast Ethernet Managed Switch User Manual
Protocol
Operation
address
length
ARP reply
Source address
00-20-5C-01-22-22
Sender
H/W address
00-20-5C-01-11-11
Ether-type
ARP
267
Sender
Target
protocol
H/W address
address
10.10.10.1
00-20-5C-01-22-22
FCS
Target
protocol
address
10.10.10.2

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