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Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter 31 Configuring IP Unicast Routing
Configuring IP Addressing on Layer 3 Interfaces
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:
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 determine 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:
To disable proxy ARP on the interface, use the no ip proxy-arp interface configuration command.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Enter interface configuration mode, and specify the Layer 3
interface to configure.
Step 3
arp {arpa | snap} Specify the ARP encapsulation method:
• arpa—Address Resolution Protocol
• snap—Subnetwork Address Protocol
Step 4
end Return to privileged EXEC mode.
Step 5
show interfaces [interface-id] Verify ARP encapsulation configuration on all interfaces or
the specified interface.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Enter interface configuration mode, and specify the Layer 3
interface to configure.
Step 3
ip proxy-arp Enable proxy ARP on the interface.
Step 4
end Return to privileged EXEC mode.
Step 5
show ip interface [interface-id] Verify the configuration on the interface or all interfaces.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
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