DWS-3160 Series Gigabit Ethernet Unified Switch CLI Reference Guide
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Table 1. ARP Payload
The ARP request will be encapsulated into an Ethernet frame and sent out. As can be seen in
Table 2, the “Source Address” in the Ethernet frame will be PC A’s MAC address. Since an ARP
request is sent via broadcast, the “Destination address” is in a format of Ethernet broadcast (FF-
FF-FF-FF-FF-FF).
Table 2. Ethernet Frame Format
When the Switch receives the frame, it will check the “Source Address” in the Ethernet frame’s
header. If the address is not in its Forwarding Table, the Switch will learn PC A’s MAC and the
associated port into its Forwarding Table.
In addition, when the Switch receives the broadcasted ARP request, it will flood the frame to all
ports except the source port, port 1 (see Figure 2).
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