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26.2 ARP Local Proxy Function Configuration Task List
1．Enable/disable ARP local proxy function
ip local proxy-arp
Enable or disable ARP local proxy function.
26.3 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
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