Manual

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20.2 ARP Local Proxy Function Configuration Task List
1. Enable/disable ARP local proxy function
Command
Explanation
Interface vlan mode
ip local proxy-arp
no ip local proxy-arp
Enable or disable ARP local proxy function.
20.3 Typical Examples of ARP Local Proxy Function
As shown in the following figure, S1 is a medium/high-level layer-3 switch supporting ARP
local proxy, S2 is layer-2 access switches supporting interface isolation.
Considering security, interface isolation function is enabled on S2. Thus all downlink ports of
S2 is isolated from each other, making all ARP messages able to be forwarded through S1. If
ARP local proxy is enabled on S1, then all interfaces on S1 isolate ARP while S1 serves as an
ARP proxy. As a result, IP flow will be forwarded at layer 3 through S1 instead of S2.
We can configure as follows:
Switch(config)#interface vlan 1
Switch(Config-if-Vlan1)#ip address 192.168.1.1 255.255.255.0
Switch(Config-if-Vlan1)#ip local proxy-arp
Switch(Config-if-Vlan1)#exit
20.4 ARP Local Proxy Function Troubleshooting
ARP local proxy function is disabled by default. Users can view the current configuration with
display command. With correct configuration, by enabling debug of ARP, users can check
whether the ARP proxy is normal and send proxy ARP messages.