Luxul XMS-1024P - Manual (Page 190)

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XMS-1024P
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LUX-UG-XMS-1024P Vers: 081314
Figure 12-3 ARP Procedure
„
Suppose there are two devices in the LAN: Host A and Host B. To send a packet to
Host B, Host A checks its own ARP Table fi rst to see if the ARP entry related to the
IP Address of Host B exists. If it does exist, Host A will send the packets to Host B
directly. If the corresponding MAC address is not found in the ARP Table, Host A
will broadcast ARP Request Packets, which contain the IP Address of Host B, the IP
Address of Host A, and the MAC address of Host A.
„
Since the ARP Request Packets are broadcast, all devices in the LAN receive them.
Only Host B recognizes and responds to the request. Host B sends back an ARP Reply
Packet to Host A, with its MAC Address.
„
Upon receipt of the ARP Reply Packet, Host A adds the IP Address and the corre-
sponding MAC Address of Host B to its ARP Table for further packet forwarding.
The ARP Scanning function allows the Switch to send the ARP Request Packets of the
specifi ed IP Field to the devices in the LAN or VLAN. Upon receiving the ARP Reply
Packet, the Switch can gather the IP Address, MAC Address, VLAN and the connected
Port Number of a device by analyzing the packet and can be used to Bind the Entry.