PLANET XGS3-24042 - Manual (Page 208)

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In the network, topology shown in the graph above, IP URPF function is enabled on SW3. When there is
someone in the network pretending to be someone else by using his IP address to launch a vicious attack, the
switch will drop all the attacking messages directly through the hardware function.
Enable the URPF function in SW3.
SW3 configuration task sequence:
Switch3#config
Switch3(config)#urpf enable
22.4.4 URPF Troubleshooting
 If all configurations are normal but URPF still can’t operate as expected, please enable the URPF
debug function and use “show urpf” command to observe whether URPF is enabled, and send the
result to the technology service center.
22.5 ARP
22.5.1 Introduction to ARP
ARP (Address Resolution Protocol) is mainly used to resolve IP address to Ethernet MAC address. Switch
supports both dynamic ARP and static ARP configuration.Furthermore, switch supports the configuration of
proxy ARP for some applications. For instance, when an ARP request is received on the port, requesting an IP
address in the same IP segment of the port but not the same physical network, if the port has enabled proxy
ARP, the port would reply to the ARP with its own MAC address and forward the actual packets received.
Enabling proxy ARP allows machines physically separated but of the same IP segment ignores the physical
separation and communicate via proxy ARP interface as if in the same physical network.
22.5.2 ARP Configuration Task List
ARP Configuration Task List:
1. Configure static ARP
2. Configure proxy ARP