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Click IP, ARP, General. Set the timeout to a suitable value for the ARP cache,
enable Proxy ARP for subnetworks that do not have routing or a default gateway,
and click Apply.
Figure 19-3 ARP General
CLI - This example sets the ARP cache timeout for 15 minutes (i.e., 900 seconds),
and enables Proxy ARP for VLAN 3.
Console(config)#arp-timeout 900
Console(config)#interface vlan 3
Console(config-if)#ip proxy-arp
Console(config-if)#
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