DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch
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Table-3 (ARP Payload)
H/W
Type
Protocol
Type
H/W Address
Length
Protocol
Address
Length
Operation Sender
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 00-00-00-00-00-00 10.10.10.2
When PC B replies to 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).
Table-4 (Ethernet frame format)
Destination address
00-20-5C-01-11-11
Source address
00-20-5C-01-22-22
Ether-type ARP FCS
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.
Port1 00-20-5C-01-11-11
Port2 00-20-5C-01-22-22
Forwarding Table
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