Set Arp Encapsulation; Enable Proxy Arp - Cisco WS-C3750-48PS-S Software Configuration Manual

Chapter 34 Configuring IP Unicast Routing

Set ARP Encapsulation

By default, Ethernet ARP encapsulation (represented by the arpa keyword) is enabled on an IP interface.
You can change the encapsulation methods to SNAP if required by your network.
Beginning in privileged EXEC mode, follow these steps to specify the ARP encapsulation type:
Command
Step 1
configure terminal
Step 2 interface interface-id
Step 3 arp {arpa | snap}
Step 4
end
Step 5 show interfaces [interface-id]
Step 6 copy running-config startup-config
To disable an encapsulation type, use the no arp arpa or no arp snap interface configuration command.

Enable Proxy ARP

By default, the switch uses proxy ARP to help hosts learn MAC addresses of hosts on other networks or
subnets.
Beginning in privileged EXEC mode, follow these steps to enable proxy ARP if it has been disabled:
Command
Step 1 configure terminal
Step 2
interface interface-id
Step 3
ip proxy-arp
Step 4 end
Step 5 show ip interface [interface-id]
Step 6
copy running-config startup-config
To disable proxy ARP on the interface, use the no ip proxy-arp interface configuration command.
78-16180-02
Purpose
Enter global configuration mode.
Enter interface configuration mode, and specify the Layer 3
interface to configure.
Specify the ARP encapsulation method:
arpa—Address Resolution Protocol
•
snap—Subnetwork Address Protocol
•
Return to privileged EXEC mode.
Verify ARP encapsulation configuration on all interfaces or
the specified interface.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Enter interface configuration mode, and specify the Layer 3
interface to configure.
Enable proxy ARP on the interface.
Return to privileged EXEC mode.
Verify the configuration on the interface or all interfaces.
(Optional) Save your entries in the configuration file.
Catalyst 3750 Switch Software Configuration Guide
Configuring IP Addressing
34-11