D-Link xStack DGS-3200-10 User Manual page 271

xStack
Figure 2
When the switch floods the frame of ARP request to the network, all PCs will receive and examine the frame but only PC B will
reply the query as the destination IP matched (see Figure 3).
Figure 3
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 an Ethernet frame again and sent back to the sender. The ARP reply is in a
form of Unicast communication.
Table 3. ARP Payload
H/W Protocol H/W
Type Type Address
Length
When PC B replies to th e query, the "Destination Address" in the Ethernet frame will be ch anged to PC A's M AC address. The
"Source Address" will be changed to PC B's MAC address (see Table 4).
Table 4. Ethernet Frame Format
Destination Address
00-20-5C-01-11-11
®
DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch
Protocol Operation
Address
Length
ARP reply
Source Address
00-20-5C-01-22-22
Sender
H/W Address Protocol
Address
00-20-5C-01-11-11 10.10.10.1
Ether-Type
258
Sender Target
H/W Address
00-20-5C-01-22-22
ARP FCS
Target
Protocol
Address
10.10.10.2